diff --git a/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/BrowserAPI.kt b/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/BrowserAPI.kt
index 7b1e44dc16..3c55709bf3 100644
--- a/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/BrowserAPI.kt
+++ b/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/BrowserAPI.kt
@@ -10,18 +10,18 @@ import org.w3c.dom.css.CSSRule
 import org.w3c.dom.css.CSSRuleList
 
 
-external class CSSKeyframesRule: CSSRule {
+internal external class CSSKeyframesRule: CSSRule {
     val name: String
     val cssRules: CSSRuleList
 }
 
-inline fun CSSKeyframesRule.appendRule(cssRule: String) {
+internal inline fun CSSKeyframesRule.appendRule(cssRule: String) {
     this.asDynamic().appendRule(cssRule)
 }
 
 @Suppress("NOTHING_TO_INLINE")
-inline fun <T : Any> jsObject(): T =
+internal inline fun <T : Any> jsObject(): T =
     js("({})")
 
-inline fun <T : Any> jsObject(builder: T.() -> Unit): T =
+internal inline fun <T : Any> jsObject(builder: T.() -> Unit): T =
     jsObject<T>().apply(builder)
diff --git a/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/CSSKeyframeRule.kt b/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/CSSKeyframeRule.kt
index 37ef76fcef..cac9a7f9ac 100644
--- a/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/CSSKeyframeRule.kt
+++ b/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/CSSKeyframeRule.kt
@@ -67,7 +67,7 @@ class CSSKeyframesBuilder() {
     }
 }
 
-fun buildKeyframes(name: String, builder: CSSKeyframesBuilder.() -> Unit): CSSKeyframesRuleDeclaration {
+internal fun buildKeyframes(name: String, builder: CSSKeyframesBuilder.() -> Unit): CSSKeyframesRuleDeclaration {
     val frames = CSSKeyframesBuilder(builder).frames
     return CSSKeyframesRuleDeclaration(name, frames)
 }
diff --git a/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/CSSRules.kt b/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/CSSRules.kt
index e389e3a66c..0e3d2717a1 100644
--- a/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/CSSRules.kt
+++ b/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/CSSRules.kt
@@ -32,7 +32,7 @@ interface CSSGroupingRuleDeclaration: CSSRuleDeclaration {
 typealias CSSRuleDeclarationList = List<CSSRuleDeclaration>
 typealias MutableCSSRuleDeclarationList = MutableList<CSSRuleDeclaration>
 
-fun buildCSSStyleRule(cssRule: CSSStyleRuleBuilder.() -> Unit): StyleHolder {
+internal fun buildCSSStyleRule(cssRule: CSSStyleRuleBuilder.() -> Unit): StyleHolder {
     val builder = CSSRuleBuilderImpl()
     builder.cssRule()
     return builder
diff --git a/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/StyleBuilder.kt b/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/StyleBuilder.kt
index 595b078474..4bc8a20907 100644
--- a/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/StyleBuilder.kt
+++ b/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/StyleBuilder.kt
@@ -57,7 +57,7 @@ interface StyleBuilder {
     }
 }
 
-inline fun variableValue(variableName: String, fallback: StylePropertyValue? = null) =
+internal inline fun variableValue(variableName: String, fallback: StylePropertyValue? = null) =
     "var(--$variableName${fallback?.let { ", $it" } ?: ""})"
 
 external interface CSSVariableValueAs<out T : StylePropertyValue>
@@ -169,7 +169,7 @@ data class StylePropertyDeclaration(
 typealias StylePropertyList = List<StylePropertyDeclaration>
 typealias MutableStylePropertyList = MutableList<StylePropertyDeclaration>
 
-fun StylePropertyList.nativeEquals(properties: StylePropertyList): Boolean {
+internal fun StylePropertyList.nativeEquals(properties: StylePropertyList): Boolean {
     if (this.size != properties.size) return false
 
     var index = 0
diff --git a/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/StyleSheet.kt b/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/StyleSheet.kt
index 6ac77237cd..5a2b94c180 100644
--- a/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/StyleSheet.kt
+++ b/web/core/src/jsMain/kotlin/org/jetbrains/compose/web/css/StyleSheet.kt
@@ -75,7 +75,7 @@ open class StyleSheet(
     protected fun keyframes(cssKeyframes: CSSKeyframesBuilder.() -> Unit) = CSSKeyframesHolder(usePrefix, cssKeyframes)
 
     companion object {
-        var counter = 0
+        private var counter = 0
     }
 
     @Suppress("EqualsOrHashCode")
@@ -152,7 +152,7 @@ open class StyleSheet(
         StyleSheet().apply(rulesBuild).cssRules
 }
 
-fun buildCSS(
+internal fun buildCSS(
     thisClass: CSSSelector,
     thisContext: CSSSelector,
     cssRule: CSSBuilder.() -> Unit