diff --git a/settings.gradle.kts b/settings.gradle.kts
index 48990df..ed28a67 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -8,4 +8,3 @@ pluginManagement {
     }
 }
 rootProject.name = "kotlin-css-generator"
-
diff --git a/src/commonMain/kotlin/nl/astraeus/css/AlignContent.kt b/src/commonMain/kotlin/nl/astraeus/css/AlignContent.kt
deleted file mode 100644
index 9edefc5..0000000
--- a/src/commonMain/kotlin/nl/astraeus/css/AlignContent.kt
+++ /dev/null
@@ -1,17 +0,0 @@
-package nl.astraeus.css
-
-enum class AlignContent(
-    val value: String
-) : CssProperty {
-    STRETCH("stretch"),
-    CENTER("center"),
-    FLEX_START("flex-start"),
-    FLEX_END("flex-end"),
-    SPACE_BETWEEN("space-between"),
-    SPACE_AROUND("space-around"),
-    INITIAL("initial"),
-    INHERIT("inherit"),
-    ;
-
-    override fun css(): String = value
-}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/AlignItems.kt b/src/commonMain/kotlin/nl/astraeus/css/AlignItems.kt
deleted file mode 100644
index d065e3a..0000000
--- a/src/commonMain/kotlin/nl/astraeus/css/AlignItems.kt
+++ /dev/null
@@ -1,16 +0,0 @@
-package nl.astraeus.css
-
-enum class AlignItems(
-    val value: String
-) : CssProperty {
-    STRETCH("stretch"),
-    CENTER("center"),
-    FLEX_START("flex-start"),
-    FLEX_END("flex-end"),
-    BASELINE("baseline"),
-    INITIAL("initial"),
-    INHERIT("inherit"),
-    ;
-
-    override fun css(): String = value
-}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/AlignSelf.kt b/src/commonMain/kotlin/nl/astraeus/css/AlignSelf.kt
deleted file mode 100644
index abbedc8..0000000
--- a/src/commonMain/kotlin/nl/astraeus/css/AlignSelf.kt
+++ /dev/null
@@ -1,17 +0,0 @@
-package nl.astraeus.css
-
-enum class AlignSelf(
-    val value: String
-) : CssProperty {
-    AUTO("auto"),
-    STRETCH("stretch"),
-    CENTER("center"),
-    FLEX_START("flex-start"),
-    FLEX_END("flex-end"),
-    BASELINE("baseline"),
-    INITIAL("initial"),
-    INHERIT("inherit"),
-    ;
-
-    override fun css(): String = value
-}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/All.kt b/src/commonMain/kotlin/nl/astraeus/css/All.kt
deleted file mode 100644
index 6ce843a..0000000
--- a/src/commonMain/kotlin/nl/astraeus/css/All.kt
+++ /dev/null
@@ -1,12 +0,0 @@
-package nl.astraeus.css
-
-enum class All(
-    val value: String
-) : CssProperty {
-    INITIAL("initial"),
-    INHERIT("inherit"),
-    UNSET("unset"),
-    ;
-
-    override fun css(): String = value
-}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/Animation.kt b/src/commonMain/kotlin/nl/astraeus/css/Animation.kt
deleted file mode 100644
index 70daa18..0000000
--- a/src/commonMain/kotlin/nl/astraeus/css/Animation.kt
+++ /dev/null
@@ -1,29 +0,0 @@
-package nl.astraeus.css
-
-enum class AnimationDirection(
-    val value: String
-) : CssProperty {
-    NORMAL("normal"),
-    REVERSE("reverse"),
-    ALTERNATE("alternate"),
-    ALTERNATE_REVERSE("alternate-reverse"),
-    INITIAL("initial"),
-    INHERIT("inherit"),
-    ;
-
-    override fun css(): String = value
-}
-
-enum class AnimationFillMode(
-    val value: String
-) : CssProperty {
-    NONE("none"),
-    FORWARDS("forwards"),
-    BACKWARDS("backwards"),
-    BOTH("both"),
-    INITIAL("initial"),
-    INHERIT("inherit"),
-    ;
-
-    override fun css(): String = value
-}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/Color.kt b/src/commonMain/kotlin/nl/astraeus/css/Color.kt
deleted file mode 100644
index b5bdafc..0000000
--- a/src/commonMain/kotlin/nl/astraeus/css/Color.kt
+++ /dev/null
@@ -1,63 +0,0 @@
-package nl.astraeus.css
-
-fun hex(hex: String): Color = HexColor(hex)
-fun rgb(red: Int, green: Int, blue: Int): Color = RGBColor(red, green, blue)
-fun rgba(red: Int, green: Int, blue: Int, alpha: Double): Color = RGBAColor(red, green, blue, alpha)
-fun hsl(hue: Int, saturation: Int, lightness: Int): Color = HSLColor(hue, saturation, lightness)
-fun hsla(hue: Int, saturation: Int, lightness: Int, alpha: Double): Color = HSLAColor(hue, saturation, lightness, alpha)
-
-open class Color : CssProperty {
-
-    override fun css(): String = "#xxxxxx"
-
-}
-
-class HexColor(
-    val hex: String
-) : Color() {
-
-    override fun css(): String = "#$hex"
-
-}
-
-class RGBColor(
-    val red: Int,
-    val green: Int,
-    val blue: Int
-) : Color() {
-
-    override fun css(): String = "rgb($red, $green, $blue)"
-
-}
-
-class RGBAColor(
-    val red: Int,
-    val green: Int,
-    val blue: Int,
-    val alpha: Double
-) : Color() {
-
-    override fun css(): String = "rgba($red, $green, $blue, $alpha)"
-
-}
-
-class HSLColor(
-    val hue: Int,
-    val saturation: Int,
-    val lightness: Int
-) : Color() {
-
-    override fun css(): String = "hsl($hue, $saturation, $lightness)"
-
-}
-
-class HSLAColor(
-    val hue: Int,
-    val saturation: Int,
-    val lightness: Int,
-    val alpha: Double
-) : Color() {
-
-    override fun css(): String = "hsla($hue, $saturation, $lightness, $alpha)"
-
-}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/Count.kt b/src/commonMain/kotlin/nl/astraeus/css/Count.kt
deleted file mode 100644
index 4505796..0000000
--- a/src/commonMain/kotlin/nl/astraeus/css/Count.kt
+++ /dev/null
@@ -1,30 +0,0 @@
-package nl.astraeus.css
-
-
-enum class CountType {
-    NUMBER,
-    INFINITE,
-    INITIAL,
-    INHERIT
-}
-
-class Count(
-    val type: CountType,
-    val number: Int
-) : CssProperty {
-
-    override fun css(): String = when(type) {
-        CountType.NUMBER -> "$number"
-        CountType.INFINITE -> "infinite"
-        CountType.INITIAL -> "initial"
-        CountType.INHERIT -> "inherit"
-    }
-
-    companion object {
-        fun count(number: Int): Count = Count(CountType.NUMBER, number)
-        fun infinite(): Count = Count(CountType.INFINITE, 0)
-        fun initial(): Count = Count(CountType.INITIAL, 0)
-        fun inherit(): Count = Count(CountType.INHERIT, 0)
-    }
-}
-
diff --git a/src/commonMain/kotlin/nl/astraeus/css/CssBuilder.kt b/src/commonMain/kotlin/nl/astraeus/css/CssBuilder.kt
index 2b51a9a..fe4cebd 100644
--- a/src/commonMain/kotlin/nl/astraeus/css/CssBuilder.kt
+++ b/src/commonMain/kotlin/nl/astraeus/css/CssBuilder.kt
@@ -1,113 +1,6 @@
 package nl.astraeus.css
 
-@DslMarker
-annotation class CssTagMarker
-
-@CssTagMarker
-open class Style(
-    var alignContent: AlignContent? = null,
-    var alignItems: AlignItems? = null,
-    var alignSelf: AlignSelf? = null,
-    var all: All? = null,
-    var animation: TextProperty? = null,
-    var animationDelay: DelayDuration? = null,
-    var animationDirection: AnimationDirection? = null,
-    var animationDuration: DelayDuration? = null,
-    var animationFillMode: AnimationFillMode? = null,
-    var animationIterationCount: Count? = null,
-    var backgroundColor: Color? = null,
-    var color: Color? = null,
-    var fontFamily: TextProperty? = null,
-    var fontSize: FontSize? = null,
-    var height: Measurement? = null,
-    var left: Measurement? = null,
-    var top: Measurement? = null,
-    var transitionDelay: DelayDuration? = null,
-    var transitionDuration: DelayDuration? = null,
-    var width: Measurement? = null
-) {
-
-    fun getMapping() = mapOf(
-        "align-content" to alignContent,
-        "align-items" to alignItems,
-        "align-self" to alignSelf,
-        "all" to all,
-        "animation" to animation,
-        "animation-delay" to animationDelay,
-        "animation-direction" to animationDirection,
-        "animation-duration" to animationDuration,
-        "animation-fill-mode" to animationFillMode,
-        "animation-iteration-count" to animationIterationCount,
-        "background-color" to backgroundColor,
-        "color" to color,
-        "font-family" to fontFamily,
-        "font-size" to fontSize,
-        "height" to height,
-        "left" to left,
-        "top" to top,
-        "transition-delay" to transitionDelay,
-        "transition-duration" to transitionDuration,
-        "width" to width
-    )
-
-    fun propertyCss(indent: String, name: String, prop: CssProperty?): String = if (prop != null) {
-        "$indent$name: ${prop.css()};\n"
-    } else {
-        ""
-    }
-
-    fun generatePropertyCss(indent: String): String {
-        val builder = StringBuilder()
-
-        for ((name, prop) in getMapping()) {
-            builder.append(propertyCss(indent, name, prop))
-        }
-
-        return builder.toString()
-    }
-
-}
-
-@CssTagMarker
-open class StyleDefinition : Style() {
-    val definitions: MutableMap<String, StyleDefinition> = mutableMapOf()
-    val includes: MutableList<Style> = mutableListOf()
-
-    fun css(selector: String, style: StyleDefinition.() -> Unit) {
-        val styleValue = StyleDefinition()
-
-        style(styleValue)
-
-        definitions[selector] = styleValue
-    }
-
-    fun include(style: Style) {
-        includes.add(style)
-    }
-
-    open fun generateCss(namespace: String = "", indent: String = "  "): String {
-        val builder = StringBuilder()
-
-        for ((name, prop) in definitions) {
-            val css = StringBuilder()
-            css.append(prop.generatePropertyCss(indent))
-            for (style in prop.includes) {
-                css.append(style.generatePropertyCss(indent))
-            }
-            if (css.isNotBlank()) {
-                builder.append("$namespace $name".trim())
-                builder.append(" {\n")
-                builder.append(css)
-                builder.append("}\n\n")
-            }
-
-            builder.append(prop.generateCss( "${namespace} $name".trim(), indent))
-        }
-
-        return builder.toString()
-    }
-
-}
+import nl.astraeus.css.style.StyleDefinition
 
 fun css(definition: StyleDefinition.() -> Unit): StyleDefinition {
     val css = StyleDefinition()
@@ -118,7 +11,8 @@ fun css(definition: StyleDefinition.() -> Unit): StyleDefinition {
 }
 
 class CssBuilder {
-    var definition: StyleDefinition = StyleDefinition()
+    var definition: StyleDefinition =
+        StyleDefinition()
 
     fun style(definition: StyleDefinition.() -> Unit) {
         definition(this.definition)
diff --git a/src/commonMain/kotlin/nl/astraeus/css/CssProperty.kt b/src/commonMain/kotlin/nl/astraeus/css/CssProperty.kt
deleted file mode 100644
index 7558495..0000000
--- a/src/commonMain/kotlin/nl/astraeus/css/CssProperty.kt
+++ /dev/null
@@ -1,17 +0,0 @@
-package nl.astraeus.css
-
-interface CssProperty {
-
-    fun css(): String
-
-}
-
-fun text(value: String) = TextProperty(value)
-
-class TextProperty(
-    val value: String
-): CssProperty {
-
-    override fun css(): String = value
-
-}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/DelayDuration.kt b/src/commonMain/kotlin/nl/astraeus/css/DelayDuration.kt
deleted file mode 100644
index 7d7f2ae..0000000
--- a/src/commonMain/kotlin/nl/astraeus/css/DelayDuration.kt
+++ /dev/null
@@ -1,25 +0,0 @@
-package nl.astraeus.css
-
-
-enum class DelayDurationType {
-    TIME,
-    INITIAL,
-    INHERIT
-}
-
-class DelayDuration(
-    val type: DelayDurationType,
-    val seconds: Int
-) : CssProperty {
-
-    override fun css(): String = when(type) {
-        DelayDurationType.TIME -> "${seconds}s"
-        DelayDurationType.INITIAL -> "initial"
-        DelayDurationType.INHERIT -> "inherit"
-    }
-
-}
-
-fun seconds(seconds: Int): DelayDuration = DelayDuration(DelayDurationType.TIME, seconds)
-fun initial(): DelayDuration = DelayDuration(DelayDurationType.INITIAL, 0)
-fun inherit(): DelayDuration = DelayDuration(DelayDurationType.INHERIT, 0)
diff --git a/src/commonMain/kotlin/nl/astraeus/css/Measurement.kt b/src/commonMain/kotlin/nl/astraeus/css/Measurement.kt
deleted file mode 100644
index d54d030..0000000
--- a/src/commonMain/kotlin/nl/astraeus/css/Measurement.kt
+++ /dev/null
@@ -1,58 +0,0 @@
-package nl.astraeus.css
-
-fun px(nr: Int): Measurement = Measurement(MeasurementType.PX, nr)
-fun em(nr: Int): Measurement = Measurement(MeasurementType.EM, nr)
-fun perc(nr: Int): Measurement = Measurement(MeasurementType.PERCENTAGE, nr)
-fun pc(nr: Int): Measurement = Measurement(MeasurementType.PICAS, nr)
-
-enum class MeasurementType {
-    PX,
-    EM,
-    PERCENTAGE,
-    PICAS,
-    OTHER
-}
-
-open class Measurement(
-    val type: MeasurementType,
-    val intValue: Int = 0,
-    val stringValue: String = ""
-) : CssProperty {
-
-    override fun css(): String = when(type) {
-        MeasurementType.PX -> {
-            "${intValue}px"
-        }
-        MeasurementType.EM -> {
-            "${intValue}em"
-        }
-        MeasurementType.PERCENTAGE -> {
-            "${stringValue}%"
-        }
-        MeasurementType.PICAS -> {
-            "${stringValue}pc"
-        }
-        else -> {
-            error("Unhandled type $type")
-        }
-    }
-
-}
-
-enum class FontSizeType {
-    PX,
-    EM,
-    PERCENTAGE,
-}
-
-class FontSize(
-    val fontType: FontSizeType,
-    intValue: Int = 0,
-    stringValue: String = ""
-) : Measurement(
-    MeasurementType.PX,
-    intValue,
-    stringValue
-) {
-    override fun css(): String = "12px"
-}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/properties/AlignContent.kt b/src/commonMain/kotlin/nl/astraeus/css/properties/AlignContent.kt
new file mode 100644
index 0000000..611f9ad
--- /dev/null
+++ b/src/commonMain/kotlin/nl/astraeus/css/properties/AlignContent.kt
@@ -0,0 +1,17 @@
+package nl.astraeus.css.properties
+
+class AlignContent(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun stretch() = AlignContent("stretch")
+        fun center() = AlignContent("center")
+        fun flexStart() = AlignContent("flex-start")
+        fun flexEnd() = AlignContent("flex-end")
+        fun spaceBetween() = AlignContent("space-between")
+        fun spaceAround() = AlignContent("space-around")
+        fun initial() = AlignContent("initial")
+        fun inherit() = AlignContent("inherit")
+    }
+}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/properties/AlignItems.kt b/src/commonMain/kotlin/nl/astraeus/css/properties/AlignItems.kt
new file mode 100644
index 0000000..070cbb0
--- /dev/null
+++ b/src/commonMain/kotlin/nl/astraeus/css/properties/AlignItems.kt
@@ -0,0 +1,17 @@
+package nl.astraeus.css.properties
+
+class AlignItems(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun stretch() = AlignItems("stretch")
+        fun center() = AlignItems("center")
+        fun flexStart() = AlignItems("flex-start")
+        fun flexEnd() = AlignItems("flex-end")
+        fun baseline() = AlignItems("baseline")
+        fun initial() = AlignItems("initial")
+        fun inherit() = AlignItems("inherit")
+    }
+
+}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/properties/AlignSelf.kt b/src/commonMain/kotlin/nl/astraeus/css/properties/AlignSelf.kt
new file mode 100644
index 0000000..0c5b3d2
--- /dev/null
+++ b/src/commonMain/kotlin/nl/astraeus/css/properties/AlignSelf.kt
@@ -0,0 +1,17 @@
+package nl.astraeus.css.properties
+
+class AlignSelf(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun auto() = AlignSelf("auto")
+        fun stretch() = AlignSelf("stretch")
+        fun center() = AlignSelf("center")
+        fun flexStart() = AlignSelf("flex-start")
+        fun flexEnd() = AlignSelf("flex-end")
+        fun baseline() = AlignSelf("baseline")
+        fun initial() = AlignSelf("initial")
+        fun inherit() = AlignSelf("inherit")
+    }
+}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/properties/All.kt b/src/commonMain/kotlin/nl/astraeus/css/properties/All.kt
new file mode 100644
index 0000000..73f0d18
--- /dev/null
+++ b/src/commonMain/kotlin/nl/astraeus/css/properties/All.kt
@@ -0,0 +1,14 @@
+package nl.astraeus.css.properties
+
+class All(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun initial() = All("initial")
+        fun inherit() = All("inherit")
+        fun unset() = All("unset")
+        fun revert() = All("revert")
+    }
+
+}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/properties/Animation.kt b/src/commonMain/kotlin/nl/astraeus/css/properties/Animation.kt
new file mode 100644
index 0000000..9e530bd
--- /dev/null
+++ b/src/commonMain/kotlin/nl/astraeus/css/properties/Animation.kt
@@ -0,0 +1,77 @@
+package nl.astraeus.css.properties
+
+class AnimationDirection(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun normal() = AnimationDirection("normal")
+        fun reverse() = AnimationDirection("reverse")
+        fun alternate() = AnimationDirection("alternate")
+        fun alternateReverse() = AnimationDirection("alternate-reverse")
+        fun initial() = AnimationDirection("initial")
+        fun inherit() = AnimationDirection("inherit")
+    }
+}
+
+class AnimationFillMode(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun none() = AnimationFillMode("none")
+        fun forwards() = AnimationFillMode("forwards")
+        fun backwards() = AnimationFillMode("backwards")
+        fun both() = AnimationFillMode("both")
+        fun initial() = AnimationFillMode("initial")
+        fun inherit() = AnimationFillMode("inherit")
+    }
+}
+
+class AnimationFrame(
+    value: String = ""
+): CssProperty(value) {
+
+    companion object {
+        fun name(name: String): AnimationFrame = AnimationFrame(name)
+        fun none(): AnimationFrame = AnimationFrame("none")
+        fun initial(): AnimationFrame = AnimationFrame("initial")
+        fun inherit(): AnimationFrame = AnimationFrame("inherit")
+    }
+}
+
+
+class AnimationPlayState(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun name(name: String) = AnimationPlayState(name)
+        fun paused() = AnimationPlayState("paused")
+        fun running() = AnimationPlayState("running")
+        fun initial() = AnimationPlayState("initial")
+        fun inherit() = AnimationPlayState("inherit")
+    }
+}
+
+class AnimationTimingFunction(
+    value: String = ""
+) : CssProperty(value) {
+
+    companion object {
+        fun linear() = AnimationTimingFunction("linear")
+        fun ease() = AnimationTimingFunction("ease")
+        fun easeIn() = AnimationTimingFunction("ease-in")
+        fun easeOut() = AnimationTimingFunction("ease-out")
+        fun easeInOut() = AnimationTimingFunction("ease-in-out")
+        fun cubicBezier(
+            n1: Double,
+            n2: Double,
+            n3: Double,
+            n4: Double
+        ) = AnimationTimingFunction("cubic-bezier($n1, $n2, $n3, $n4)")
+        fun initial() = AnimationTimingFunction("initial")
+        fun inherit() = AnimationTimingFunction("inherit")
+
+    }
+}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/properties/BackfaceVisibility.kt b/src/commonMain/kotlin/nl/astraeus/css/properties/BackfaceVisibility.kt
new file mode 100644
index 0000000..b5f0042
--- /dev/null
+++ b/src/commonMain/kotlin/nl/astraeus/css/properties/BackfaceVisibility.kt
@@ -0,0 +1,13 @@
+package nl.astraeus.css.properties
+
+class BackfaceVisibility(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun visible() = BackfaceVisibility("visible")
+        fun hidden() = BackfaceVisibility("hidden")
+        fun initial() = BackfaceVisibility("initial")
+        fun inherit() = BackfaceVisibility("inherit")
+    }
+}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/properties/Background.kt b/src/commonMain/kotlin/nl/astraeus/css/properties/Background.kt
new file mode 100644
index 0000000..1252bfe
--- /dev/null
+++ b/src/commonMain/kotlin/nl/astraeus/css/properties/Background.kt
@@ -0,0 +1,125 @@
+package nl.astraeus.css.properties
+
+class BackgroundAttachment(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun scroll() = BackgroundAttachment("scroll")
+        fun fixed() = BackgroundAttachment("fixed")
+        fun local() = BackgroundAttachment("local")
+        fun initial() = BackgroundAttachment("initial")
+        fun inherit() = BackgroundAttachment("inherit")
+    }
+}
+
+class BackgroundBlendMode(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun normal() = BackgroundBlendMode("normal")
+        fun multiply() = BackgroundBlendMode("multiply")
+        fun screen() = BackgroundBlendMode("screen")
+        fun overlay() = BackgroundBlendMode("overlay")
+        fun darken() = BackgroundBlendMode("darken")
+        fun lighten() = BackgroundBlendMode("lighten")
+        fun colorDodge() = BackgroundBlendMode("color-dodge")
+        fun saturation() = BackgroundBlendMode("saturation")
+        fun color() = BackgroundBlendMode("color")
+        fun luminosity() = BackgroundBlendMode("luminosity")
+    }
+}
+
+class BackgroundClip(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun borderBox() = BackgroundClip("border-box")
+        fun paddingBox() = BackgroundClip("padding-box")
+        fun contentBox() = BackgroundClip("content-box")
+        fun initial() = BackgroundClip("initial")
+        fun inherit() = BackgroundClip("inherit")
+
+    }
+}
+
+class BackgroundOrigin(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun borderBox() = BackgroundOrigin("border-box")
+        fun paddingBox() = BackgroundOrigin("padding-box")
+        fun contentBox() = BackgroundOrigin("content-box")
+        fun initial() = BackgroundOrigin("initial")
+        fun inherit() = BackgroundOrigin("inherit")
+
+    }
+}
+
+class BackgroundPosition(
+    value: String
+) : CssProperty(value) {
+
+    override fun validateMultiple(props: List<*>) {
+        for (prop in props) {
+            if (prop is CssProperty) {
+                if (prop.css() == "initial" || prop.css() == "inherit") {
+                    check(props.size == 1) {
+                        "'background-position' can only have single value when 'initial' or 'inherit'"
+                    }
+                }
+            }
+        }
+    }
+
+    companion object {
+        fun left() = BackgroundPosition("left")
+        fun center() = BackgroundPosition("center")
+        fun right() = BackgroundPosition("right")
+        fun initial() = BackgroundPosition("initial")
+        fun inherit() = BackgroundPosition("inherit")
+
+    }
+}
+
+class BackgroundRepeat(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun repeat() = BackgroundRepeat("repeat")
+        fun repeatX() = BackgroundRepeat("repeat-x")
+        fun repeatY() = BackgroundRepeat("repeat-y")
+        fun noRepeat() = BackgroundRepeat("no-repeat")
+        fun space() = BackgroundRepeat("space")
+        fun round() = BackgroundRepeat("round")
+        fun initial() = BackgroundRepeat("initial")
+        fun inherit() = BackgroundRepeat("inherit")
+        fun unset() = BackgroundRepeat("unset")
+    }
+}
+
+class BackgroundSize(
+    value: String
+) : CssProperty(value) {
+
+    override fun validateMultiple(props: List<*>) {
+        check(props.size <= 2) {
+            "'background-size' can not have more than 2 values"
+        }
+    }
+
+    companion object {
+        fun px(px: Int) = BackgroundSize("${px}px")
+        fun perc(pc: Double) = BackgroundSize("${pc}%")
+        fun auto() = BackgroundSize("auto")
+        fun cover() = BackgroundSize("cover")
+        fun contain() = BackgroundSize("contain")
+        fun initial() = BackgroundSize("initial")
+        fun inherit() = BackgroundSize("inherit")
+    }
+}
+
diff --git a/src/commonMain/kotlin/nl/astraeus/css/properties/Border.kt b/src/commonMain/kotlin/nl/astraeus/css/properties/Border.kt
new file mode 100644
index 0000000..4842b92
--- /dev/null
+++ b/src/commonMain/kotlin/nl/astraeus/css/properties/Border.kt
@@ -0,0 +1,79 @@
+package nl.astraeus.css.properties
+
+class BorderRadius(
+    value: String
+): CssProperty(value) {
+
+    override fun validateMultiple(props: List<*>) {
+        check(props.size <= 2) {
+            "'background-size' can not have more than 2 values"
+        }
+        for (prop in props) {
+            if (prop is CssProperty) {
+                if (prop.css() == "initial" || prop.css() == "inherit") {
+                    check(props.size == 1) {
+                        "'border-radius' can only have single value when 'initial' or 'inherit'"
+                    }
+                }
+            }
+        }
+    }
+
+    companion object {
+        fun px(nr: Int) = BorderRadius("${nr}px")
+        fun em(nr: Int) = BorderRadius("${nr}em")
+        fun em(nr: Double) = BorderRadius("${nr}em")
+        fun perc(nr: Int) = BorderRadius("${nr}%")
+        fun perc(nr: Double) = BorderRadius("${nr}%")
+        fun pc(nr: Int) = BorderRadius("${nr}pc")
+        fun pc(nr: Double) = BorderRadius("${nr}pc")
+        fun cm(nr: Int) = BorderRadius("${nr}cm")
+        fun cm(nr: Double) = BorderRadius("${nr}cm")
+        fun initial() = BorderRadius("initial")
+        fun inherit() = BorderRadius("inherit")
+    }
+}
+
+class BorderStyle(
+    value: String
+): CssProperty(value) {
+
+    companion object {
+        fun none() = BorderStyle("none")
+        fun hidden() = BorderStyle("hidden")
+        fun dotted() = BorderStyle("dotted")
+        fun dashed() = BorderStyle("dashed")
+        fun solid() = BorderStyle("solid")
+        fun double() = BorderStyle("double")
+        fun groove() = BorderStyle("groove")
+        fun ridge() = BorderStyle("ridge")
+        fun inset() = BorderStyle("inset")
+        fun outset() = BorderStyle("outset")
+        fun initial() = BorderStyle("initial")
+        fun inherit() = BorderStyle("inherit")
+    }
+}
+
+class BorderWidth(
+    value: String
+): CssProperty(value) {
+
+    companion object {
+        fun thin() = BorderWidth("thin")
+        fun medium() = BorderWidth("medium")
+        fun thick() = BorderWidth("thick")
+
+        fun px(nr: Int) = BorderRadius("${nr}px")
+        fun em(nr: Int) = BorderRadius("${nr}em")
+        fun em(nr: Double) = BorderRadius("${nr}em")
+        fun perc(nr: Int) = BorderRadius("${nr}%")
+        fun perc(nr: Double) = BorderRadius("${nr}%")
+        fun pc(nr: Int) = BorderRadius("${nr}pc")
+        fun pc(nr: Double) = BorderRadius("${nr}pc")
+        fun cm(nr: Int) = BorderRadius("${nr}cm")
+        fun cm(nr: Double) = BorderRadius("${nr}cm")
+
+        fun initial() = BorderWidth("initial")
+        fun inherit() = BorderWidth("inherit")
+    }
+}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/properties/Color.kt b/src/commonMain/kotlin/nl/astraeus/css/properties/Color.kt
new file mode 100644
index 0000000..0ae5869
--- /dev/null
+++ b/src/commonMain/kotlin/nl/astraeus/css/properties/Color.kt
@@ -0,0 +1,35 @@
+package nl.astraeus.css.properties
+
+class Color(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun transparant() = Color("transparant")
+        fun initial() = Color("initial")
+        fun inherit() = Color("inherit")
+        fun hex(hex: String) = Color("#$hex")
+        fun rgb(
+            red: Int,
+            green: Int,
+            blue: Int
+        ) = Color("rgb($red, $green, $blue)")
+        fun rgba(
+            red: Int,
+            green: Int,
+            blue: Int,
+            alpha: Double
+        ) = Color("rgba($red, $green, $blue, $alpha)")
+        fun hsl(
+            hue: Int,
+            saturation: Int,
+            lightness: Int
+        ) = Color("hsl($hue, $saturation, $lightness)")
+        fun hsla(
+            hue: Int,
+            saturation: Int,
+            lightness: Int,
+            alpha: Double
+        ) = Color("hsla($hue, $saturation, $lightness, $alpha)")
+    }
+}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/properties/Count.kt b/src/commonMain/kotlin/nl/astraeus/css/properties/Count.kt
new file mode 100644
index 0000000..fbaa7b3
--- /dev/null
+++ b/src/commonMain/kotlin/nl/astraeus/css/properties/Count.kt
@@ -0,0 +1,17 @@
+package nl.astraeus.css.properties
+
+class  Count(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun count(number: Int): Count =
+            Count("$number")
+        fun infinite(): Count =
+            Count("infinite")
+        fun initial(): Count =
+            Count("initial")
+        fun inherit(): Count =
+            Count("inherit")
+    }
+}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/properties/CssProperty.kt b/src/commonMain/kotlin/nl/astraeus/css/properties/CssProperty.kt
new file mode 100644
index 0000000..35fd2c9
--- /dev/null
+++ b/src/commonMain/kotlin/nl/astraeus/css/properties/CssProperty.kt
@@ -0,0 +1,17 @@
+package nl.astraeus.css.properties
+
+open class CssProperty(
+    val value: String
+) {
+    fun css(): String = value
+
+    open fun validate() {}
+
+    open fun validateMultiple(props: List<*>) {}
+}
+
+fun text(value: String) = TextProperty(value)
+
+class TextProperty(
+    value: String
+): CssProperty(value)
diff --git a/src/commonMain/kotlin/nl/astraeus/css/properties/DelayDuration.kt b/src/commonMain/kotlin/nl/astraeus/css/properties/DelayDuration.kt
new file mode 100644
index 0000000..4c6fafc
--- /dev/null
+++ b/src/commonMain/kotlin/nl/astraeus/css/properties/DelayDuration.kt
@@ -0,0 +1,12 @@
+package nl.astraeus.css.properties
+
+class DelayDuration(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun seconds(seconds: Int) = DelayDuration("${seconds}s")
+        fun initial() = DelayDuration("initial")
+        fun inherit() = DelayDuration("inherit")
+    }
+}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/properties/Image.kt b/src/commonMain/kotlin/nl/astraeus/css/properties/Image.kt
new file mode 100644
index 0000000..3aaec55
--- /dev/null
+++ b/src/commonMain/kotlin/nl/astraeus/css/properties/Image.kt
@@ -0,0 +1,13 @@
+package nl.astraeus.css.properties
+
+class Image(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun url(url: String) = Image("url($url)")
+        fun none() = Image("none")
+        fun initial() = Image("initial")
+        fun inherit() = Image("inherit")
+    }
+}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/properties/Measurement.kt b/src/commonMain/kotlin/nl/astraeus/css/properties/Measurement.kt
new file mode 100644
index 0000000..d7335e2
--- /dev/null
+++ b/src/commonMain/kotlin/nl/astraeus/css/properties/Measurement.kt
@@ -0,0 +1,49 @@
+package nl.astraeus.css.properties
+
+open class Measurement(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun auto() = Measurement("auto")
+        fun initial() = Measurement("initial")
+        fun inherit() = Measurement("inherit")
+        fun px(nr: Int) = Measurement("${nr}px")
+        fun em(nr: Int) = Measurement("${nr}em")
+        fun em(nr: Double) = Measurement("${nr}em")
+        fun perc(nr: Int) = Measurement("${nr}%")
+        fun perc(nr: Double) = Measurement("${nr}%")
+        fun pc(nr: Int) = Measurement("${nr}pc")
+        fun pc(nr: Double) = Measurement("${nr}pc")
+        fun cm(nr: Int) = Measurement("${nr}cm")
+        fun cm(nr: Double) = Measurement("${nr}cm")
+    }
+}
+
+class FontSize(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        fun xxSmall() = FontSize("xx-small")
+        fun xSmall() = FontSize("x-small")
+        fun small() = FontSize("small")
+        fun medium() = FontSize("medium")
+        fun large() = FontSize("large")
+        fun xLarge() = FontSize("x-large")
+        fun xxLarge() = FontSize("xx-large")
+        fun smaller() = FontSize("smaller")
+        fun larger() = FontSize("larger")
+        fun initial() = FontSize("initial")
+        fun inherit() = FontSize("inherit")
+        fun px(nr: Int) = FontSize("${nr}px")
+        fun em(nr: Int) = FontSize("${nr}em")
+        fun em(nr: Double) = FontSize("${nr}em")
+        fun perc(nr: Int) = FontSize("${nr}%")
+        fun perc(nr: Double) = FontSize("${nr}%")
+        fun pc(nr: Int) = FontSize("${nr}pc")
+        fun pc(nr: Double) = FontSize("${nr}pc")
+        fun cm(nr: Int) = FontSize("${nr}cm")
+        fun cm(nr: Double) = FontSize("${nr}cm")
+    }
+}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/style/Style.kt b/src/commonMain/kotlin/nl/astraeus/css/style/Style.kt
new file mode 100644
index 0000000..3ce63c2
--- /dev/null
+++ b/src/commonMain/kotlin/nl/astraeus/css/style/Style.kt
@@ -0,0 +1,148 @@
+package nl.astraeus.css.style
+
+import nl.astraeus.css.properties.*
+
+@DslMarker
+annotation class CssTagMarker
+
+@CssTagMarker
+open class Style(
+    var alignContent: AlignContent? = null,
+    var alignItems: AlignItems? = null,
+    var alignSelf: AlignSelf? = null,
+    var all: All? = null,
+    var animation: TextProperty? = null,
+    var animationDelay: List<DelayDuration>? = null,
+    var animationDirection: List<AnimationDirection>? = null,
+    var animationDuration: List<DelayDuration>? = null,
+    var animationFillMode: List<AnimationFillMode>? = null,
+    var animationIterationCount: List<Count>? = null,
+    var animationFrame: AnimationFrame? = null,
+    var animationName: List<TextProperty>? = null,
+    var animationPlayState: List<AnimationPlayState>? = null,
+    var animationTimingFunction: List<AnimationTimingFunction>? = null,
+    var backfaceVisibility: BackfaceVisibility? = null,
+    var background: TextProperty? = null,
+    var backgroundAttachment: BackgroundAttachment? = null,
+    var backgroundBlendMode: BackgroundBlendMode? = null,
+    var backgroundClip: BackgroundClip? = null,
+    var backgroundColor: Color? = null,
+    var backgroundImage: Image? = null,
+    var backgroundOrigin: BackgroundOrigin? = null,
+    var backgroundPosition: List<BackgroundPosition>? = null,
+    var backgroundRepeat: List<BackgroundRepeat>? = null,
+    var backgroundSize: List<BackgroundSize>? = null,
+    var border: TextProperty? = null,
+    var borderBottom: TextProperty? = null,
+    var borderColor: Color? = null,
+    var borderBottomColor: Color? = null,
+    var borderBottomLeftRadius: List<BorderRadius>? = null,
+    var borderBottomRightRadius: List<BorderRadius>? = null,
+    var borderBottomStyle: BorderStyle? = null,
+    var borderBottomWidth: BorderWidth? = null,
+    var borderLeft: TextProperty? = null,
+    var borderLeftColor: Color? = null,
+    var borderRadius: List<BorderRadius>? = null,
+    var borderRight: TextProperty? = null,
+    var borderRightColor: Color? = null,
+    var borderTop: TextProperty? = null,
+    var borderTopColor: Color? = null,
+    var color: Color? = null,
+    var fontFamily: TextProperty? = null,
+    var fontSize: FontSize? = null,
+    var height: Measurement? = null,
+    var left: Measurement? = null,
+    var top: Measurement? = null,
+    var transitionDelay: DelayDuration? = null,
+    var transitionDuration: DelayDuration? = null,
+    var width: Measurement? = null
+) {
+
+    fun getMapping() = mapOf(
+        "align-content" to alignContent,
+        "align-items" to alignItems,
+        "align-self" to alignSelf,
+        "all" to all,
+        "animation" to animation,
+        "animation-delay" to animationDelay,
+        "animation-direction" to animationDirection,
+        "animation-duration" to animationDuration,
+        "animation-fill-mode" to animationFillMode,
+        "animation-iteration-count" to animationIterationCount,
+        "animation-frame" to animationFrame,
+        "animation-name" to animationName,
+        "animation-play-state" to animationPlayState,
+        "animation-timing-function" to animationTimingFunction,
+        "backface-visibility" to backfaceVisibility,
+        "background" to background,
+        "background-attachment" to backgroundAttachment,
+        "background-blend-mode" to backgroundBlendMode,
+        "background-clip" to backgroundClip,
+        "background-color" to backgroundColor,
+        "background-image" to backgroundImage,
+        "background-origin" to backgroundOrigin,
+        "background-position" to backgroundPosition,
+        "background-repeat" to backgroundRepeat,
+        "background-size" to backgroundSize,
+        "border" to border,
+        "border-bottom" to borderBottom,
+        "border-bottom-color" to borderBottomColor,
+        "border-bottom-left-radius" to borderBottomLeftRadius,
+        "border-bottom-right-radius" to borderBottomRightRadius,
+        "border-color" to borderColor,
+        "border-left" to borderLeft,
+        "border-left-color" to borderLeftColor,
+        "border-right" to borderRight,
+        "border-right-color" to borderRightColor,
+        "border-top" to borderTop,
+        "border-top-color" to borderTopColor,
+        "color" to color,
+        "font-family" to fontFamily,
+        "font-size" to fontSize,
+        "height" to height,
+        "left" to left,
+        "top" to top,
+        "transition-delay" to transitionDelay,
+        "transition-duration" to transitionDuration,
+        "width" to width
+    )
+
+    fun propertyCss(indent: String, name: String, prop: CssProperty): String {
+        prop.validate()
+
+        return "$indent$name: ${prop.css()};\n"
+    }
+
+    fun propertyCss(indent: String, name: String, props: List<*>): String {
+        val builder = StringBuilder()
+
+        for ((index, prop) in props.withIndex()) {
+            if (prop is CssProperty) {
+                if (index == 0) {
+                    prop.validateMultiple(props)
+                }
+                if (builder.isNotEmpty()) {
+                    builder.append(", ")
+                }
+                builder.append(prop.css())
+            }
+        }
+
+        return "$indent$name: $builder;\n"
+    }
+
+    fun generatePropertyCss(indent: String): String {
+        val builder = StringBuilder()
+
+        for ((name, prop) in getMapping()) {
+            if (prop is List<*> && prop.isNotEmpty()) {
+                builder.append(propertyCss(indent, name, prop))
+            } else if (prop is CssProperty) {
+                builder.append(propertyCss(indent, name, prop))
+            }
+        }
+
+        return builder.toString()
+    }
+
+}
diff --git a/src/commonMain/kotlin/nl/astraeus/css/style/StyleDefinition.kt b/src/commonMain/kotlin/nl/astraeus/css/style/StyleDefinition.kt
new file mode 100644
index 0000000..05e058f
--- /dev/null
+++ b/src/commonMain/kotlin/nl/astraeus/css/style/StyleDefinition.kt
@@ -0,0 +1,42 @@
+package nl.astraeus.css.style
+
+@CssTagMarker
+open class StyleDefinition : Style() {
+    val definitions: MutableMap<String, StyleDefinition> = mutableMapOf()
+    val includes: MutableList<Style> = mutableListOf()
+
+    fun css(selector: String, style: StyleDefinition.() -> Unit) {
+        val styleValue = StyleDefinition()
+
+        style(styleValue)
+
+        definitions[selector] = styleValue
+    }
+
+    fun include(style: Style) {
+        includes.add(style)
+    }
+
+    open fun generateCss(namespace: String = "", indent: String = "  "): String {
+        val builder = StringBuilder()
+
+        for ((name, prop) in definitions) {
+            val css = StringBuilder()
+            css.append(prop.generatePropertyCss(indent))
+            for (style in prop.includes) {
+                css.append(style.generatePropertyCss(indent))
+            }
+            if (css.isNotBlank()) {
+                builder.append("$namespace $name".trim())
+                builder.append(" {\n")
+                builder.append(css)
+                builder.append("}\n\n")
+            }
+
+            builder.append(prop.generateCss( "${namespace} $name".trim(), indent))
+        }
+
+        return builder.toString()
+    }
+
+}
diff --git a/src/commonTest/kotlin/nl/astraeus/css/TestCssBuilder.kt b/src/commonTest/kotlin/nl/astraeus/css/TestCssBuilder.kt
index c7cbd9d..1d47bdc 100644
--- a/src/commonTest/kotlin/nl/astraeus/css/TestCssBuilder.kt
+++ b/src/commonTest/kotlin/nl/astraeus/css/TestCssBuilder.kt
@@ -1,5 +1,10 @@
 package nl.astraeus.css
 
+import nl.astraeus.css.properties.Color.Companion.hsl
+import nl.astraeus.css.properties.Color.Companion.rgba
+import nl.astraeus.css.properties.Measurement.Companion.em
+import nl.astraeus.css.properties.Measurement.Companion.px
+
 //import kotlin.test.Test
 
 object TestCssBuilder {
diff --git a/src/jsMain/kotlin/nl/astraeus/css/Test.kt b/src/jsMain/kotlin/nl/astraeus/css/Test.kt
new file mode 100644
index 0000000..bc7ff0d
--- /dev/null
+++ b/src/jsMain/kotlin/nl/astraeus/css/Test.kt
@@ -0,0 +1,99 @@
+package nl.astraeus.css
+
+import nl.astraeus.css.properties.*
+import nl.astraeus.css.properties.Measurement.Companion.em
+import nl.astraeus.css.properties.Measurement.Companion.px
+import nl.astraeus.css.style.StyleDefinition
+
+class StyleBase(
+    val mainColor: Color = Color.hsl(128, 50, 50),
+    val mainBackgroundColor: Color = Color.hsl(64, 50, 50),
+    val mainFont: TextProperty = text("Arial")
+)
+
+private fun StyleDefinition.sizePX(
+    left: Int,
+    top: Int,
+    width: Int,
+    height: Int
+) {
+    this@sizePX.top = px(top)
+    this@sizePX.left = px(left)
+    this@sizePX.width = px(width)
+    this@sizePX.height = px(height)
+}
+
+private fun generateCss(
+    base: StyleBase
+): String {
+    val css = CssBuilder()
+
+    css.style {
+        css("body") {
+            fontFamily = base.mainFont
+            color = base.mainColor
+            backgroundColor = base.mainBackgroundColor
+            alignContent = AlignContent.initial()
+        }
+
+        css(".test") {
+            top = px(10)
+            left = em(5)
+            backgroundColor = Color.rgba(255, 255, 255, 0.75)
+
+            css("> a") {
+                color = Color.hsl(200, 50, 50)
+            }
+        }
+
+        css("nav") {
+            css("ul") {
+                color = Color.hsl(0, 100, 25)
+                backgroundColor = base.mainBackgroundColor
+            }
+            css("li") {
+                sizePX(25, 25, 200, 200)
+
+                css("a") {
+                    width = px(725)
+                    background = text("")
+                    backgroundColor = base.mainBackgroundColor
+                }
+            }
+        }
+    }
+
+    return css.getCss()
+}
+
+fun main() {
+    val css1 = generateCss(StyleBase())
+    val css2 = generateCss(StyleBase(
+        Color.hsl(32, 40, 50),
+        Color.hsl(64, 60, 35),
+        text("Courier")
+    ))
+
+    println(css1)
+    println(css2)
+
+    val sd = css {
+        css("#pipo") {
+            backgroundColor = Color.hex("eeeeee")
+            fontFamily = text("Arial, Courier")
+            animationDelay = listOf(DelayDuration.initial())
+
+            css("div") {
+                color = Color.hex("1b1b1b1")
+                alignContent = AlignContent.flexStart()
+                animationName = listOf(text("foo"), text("bar"))
+                animationIterationCount = listOf(
+                    Count.count(3), Count.infinite())
+                animationTimingFunction = listOf(AnimationTimingFunction.cubicBezier(0.1, 0.2, 0.3, 0.4), AnimationTimingFunction.easeInOut())
+            }
+        }
+    }
+
+    println("======")
+    println(sd.generateCss())
+}
diff --git a/src/jvmMain/kotlin/nl/astraeus/css/Test.kt b/src/jvmMain/kotlin/nl/astraeus/css/Test.kt
index a29ec5f..2764eff 100644
--- a/src/jvmMain/kotlin/nl/astraeus/css/Test.kt
+++ b/src/jvmMain/kotlin/nl/astraeus/css/Test.kt
@@ -1,8 +1,12 @@
 package nl.astraeus.css
 
+import nl.astraeus.css.properties.*
+import nl.astraeus.css.properties.AlignContent.Companion.flexStart
+import nl.astraeus.css.style.StyleDefinition
+
 class StyleBase(
-    val mainColor: Color = hsl(128, 50, 50),
-    val mainBackgroundColor: Color = hsl(64, 50, 50),
+    val mainColor: Color = Color.hsl(128, 50, 50),
+    val mainBackgroundColor: Color = Color.hsl(64, 50, 50),
     val mainFont: TextProperty = text("Arial")
 )
 
@@ -12,10 +16,10 @@ private fun StyleDefinition.sizePX(
     width: Int,
     height: Int
 ) {
-    this@sizePX.top = px(top)
-    this@sizePX.left = px(left)
-    this@sizePX.width = px(width)
-    this@sizePX.height = px(height)
+    this@sizePX.top = Measurement.px(top)
+    this@sizePX.left = Measurement.px(left)
+    this@sizePX.width = Measurement.px(width)
+    this@sizePX.height = Measurement.px(height)
 }
 
 private fun generateCss(
@@ -31,26 +35,28 @@ private fun generateCss(
         }
 
         css(".test") {
-            top = px(10)
-            left = em(5)
-            backgroundColor = rgba(255, 255, 255, 0.75)
+            top = Measurement.px(10)
+            left = Measurement.em(5)
+            backgroundColor = Color.rgba(255, 255, 255, 0.75)
 
             css("> a") {
-                color = hsl(200, 50, 50)
+                color = Color.hsl(200, 50, 50)
             }
         }
 
         css("nav") {
             css("ul") {
-                color = hsl(0, 100, 25)
+                color = Color.hsl(0, 100, 25)
                 backgroundColor = base.mainBackgroundColor
             }
             css("li") {
                 sizePX(25, 25, 200, 200)
 
                 css("a") {
-                    width = px(725)
+                    width = Measurement.px(725)
+                    background = text("")
                     backgroundColor = base.mainBackgroundColor
+                    all = All.initial()
                 }
             }
         }
@@ -62,8 +68,8 @@ private fun generateCss(
 fun main() {
     val css1 = generateCss(StyleBase())
     val css2 = generateCss(StyleBase(
-        hsl(32, 40, 50),
-        hsl(64, 60, 35),
+        Color.hsl(32, 40, 50),
+        Color.hsl(64, 60, 35),
         text("Courier")
     ))
 
@@ -72,14 +78,17 @@ fun main() {
 
     val sd = css {
         css("#pipo") {
-            backgroundColor = hex("eeeeee")
+            backgroundColor = Color.hex("eeeeee")
             fontFamily = text("Arial, Courier")
-            animationDelay = initial()
+            animationDelay = listOf(DelayDuration.initial())
 
             css("div") {
-                color = hex("1b1b1b1")
-                alignContent = AlignContent.FLEX_START
-                animationIterationCount = Count.count(3)
+                color = Color.hex("1b1b1b1")
+                alignContent = flexStart()
+                animationName = listOf(text("foo"), text("bar"))
+                animationIterationCount = listOf(
+                    Count.count(3), Count.infinite())
+                animationTimingFunction = listOf(AnimationTimingFunction.cubicBezier(0.1, 0.2, 0.3, 0.4), AnimationTimingFunction.easeInOut())
             }
         }
     }