diff --git a/src/builtin/color_hsl.rs b/src/builtin/color/hsl.rs
similarity index 100%
rename from src/builtin/color_hsl.rs
rename to src/builtin/color/hsl.rs
diff --git a/src/builtin/color/mod.rs b/src/builtin/color/mod.rs
new file mode 100644
index 0000000..e2f7a27
--- /dev/null
+++ b/src/builtin/color/mod.rs
@@ -0,0 +1,15 @@
+use std::collections::BTreeMap;
+
+use super::Builtin;
+
+mod hsl;
+mod opacity;
+mod other;
+mod rgb;
+
+pub(crate) fn register(f: &mut BTreeMap<String, Builtin>) {
+    hsl::register(f);
+    opacity::register(f);
+    other::register(f);
+    rgb::register(f);
+}
diff --git a/src/builtin/color/opacity.rs b/src/builtin/color/opacity.rs
new file mode 100644
index 0000000..419bacc
--- /dev/null
+++ b/src/builtin/color/opacity.rs
@@ -0,0 +1,70 @@
+use std::collections::BTreeMap;
+
+use super::Builtin;
+use crate::common::QuoteKind;
+use crate::units::Unit;
+use crate::value::{Number, Value};
+
+pub(crate) fn register(f: &mut BTreeMap<String, Builtin>) {
+    decl!(f "alpha", |args, _| {
+        match arg!(args, 0, "color") {
+            Value::Color(c) => Some(Value::Dimension(c.alpha() / Number::from(255), Unit::None)),
+            _ => todo!("non-color given to builtin function `alpha()`")
+        }
+    });
+    decl!(f "opacity", |args, _| {
+        match arg!(args, 0, "color") {
+            Value::Color(c) => Some(Value::Dimension(c.alpha() / Number::from(255), Unit::None)),
+            Value::Dimension(num, unit) => Some(Value::Ident(format!("opacity({}{})", num , unit), QuoteKind::None)),
+            _ => todo!("non-color given to builtin function `opacity()`")
+        }
+    });
+    decl!(f "opacify", |args, _| {
+        let color = match arg!(args, 0, "color").eval() {
+            Value::Color(c) => c,
+            _ => todo!("non-color given to builtin function `opacify()`")
+        };
+        let amount = match arg!(args, 1, "amount").eval() {
+            Value::Dimension(n, Unit::None) => n,
+            Value::Dimension(n, Unit::Percent) => n / Number::from(100),
+            _ => todo!("expected either unitless or % number for amount"),
+        };
+        Some(Value::Color(color.fade_in(amount)))
+    });
+    decl!(f "fade-in", |args, _| {
+        let color = match arg!(args, 0, "color").eval() {
+            Value::Color(c) => c,
+            _ => todo!("non-color given to builtin function `fade-in()`")
+        };
+        let amount = match arg!(args, 1, "amount").eval() {
+            Value::Dimension(n, Unit::None) => n,
+            Value::Dimension(n, Unit::Percent) => n / Number::from(100),
+            _ => todo!("expected either unitless or % number for amount"),
+        };
+        Some(Value::Color(color.fade_in(amount)))
+    });
+    decl!(f "transparentize", |args, _| {
+        let color = match arg!(args, 0, "color").eval() {
+            Value::Color(c) => c,
+            _ => todo!("non-color given to builtin function `transparentize()`")
+        };
+        let amount = match arg!(args, 1, "amount").eval() {
+            Value::Dimension(n, Unit::None) => n,
+            Value::Dimension(n, Unit::Percent) => n / Number::from(100),
+            _ => todo!("expected either unitless or % number for amount"),
+        };
+        Some(Value::Color(color.fade_out(amount)))
+    });
+    decl!(f "fade-out", |args, _| {
+        let color = match arg!(args, 0, "color").eval() {
+            Value::Color(c) => c,
+            _ => todo!("non-color given to builtin function `fade-out()`")
+        };
+        let amount = match arg!(args, 1, "amount").eval() {
+            Value::Dimension(n, Unit::None) => n,
+            Value::Dimension(n, Unit::Percent) => n / Number::from(100),
+            _ => todo!("expected either unitless or % number for amount"),
+        };
+        Some(Value::Color(color.fade_out(amount)))
+    });
+}
\ No newline at end of file
diff --git a/src/builtin/color/other.rs b/src/builtin/color/other.rs
new file mode 100644
index 0000000..74b54dd
--- /dev/null
+++ b/src/builtin/color/other.rs
@@ -0,0 +1,7 @@
+use std::collections::BTreeMap;
+
+use super::Builtin;
+
+pub(crate) fn register(_f: &mut BTreeMap<String, Builtin>) {
+    
+}
\ No newline at end of file
diff --git a/src/builtin/color.rs b/src/builtin/color/rgb.rs
similarity index 66%
rename from src/builtin/color.rs
rename to src/builtin/color/rgb.rs
index 4ff32d4..5ee68d1 100644
--- a/src/builtin/color.rs
+++ b/src/builtin/color/rgb.rs
@@ -2,7 +2,6 @@ use std::collections::BTreeMap;
 
 use super::Builtin;
 use crate::color::Color;
-use crate::common::QuoteKind;
 use crate::units::Unit;
 use crate::value::{Number, Value};
 
@@ -120,65 +119,4 @@ pub(crate) fn register(f: &mut BTreeMap<String, Builtin>) {
             _ => todo!("non-color given to builtin function `blue()`")
         }
     });
-    decl!(f "opacity", |args, _| {
-        match arg!(args, 0, "color") {
-            Value::Color(c) => Some(Value::Dimension(c.alpha() / Number::from(255), Unit::None)),
-            Value::Dimension(num, unit) => Some(Value::Ident(format!("opacity({}{})", num , unit), QuoteKind::None)),
-            _ => todo!("non-color given to builtin function `opacity()`")
-        }
-    });
-    decl!(f "alpha", |args, _| {
-        match arg!(args, 0, "color") {
-            Value::Color(c) => Some(Value::Dimension(c.alpha() / Number::from(255), Unit::None)),
-            _ => todo!("non-color given to builtin function `alpha()`")
-        }
-    });
-    decl!(f "opacify", |args, _| {
-        let color = match arg!(args, 0, "color").eval() {
-            Value::Color(c) => c,
-            _ => todo!("non-color given to builtin function `opacify()`")
-        };
-        let amount = match arg!(args, 1, "amount").eval() {
-            Value::Dimension(n, Unit::None) => n,
-            Value::Dimension(n, Unit::Percent) => n / Number::from(100),
-            _ => todo!("expected either unitless or % number for amount"),
-        };
-        Some(Value::Color(color.fade_in(amount)))
-    });
-    decl!(f "fade-in", |args, _| {
-        let color = match arg!(args, 0, "color").eval() {
-            Value::Color(c) => c,
-            _ => todo!("non-color given to builtin function `fade-in()`")
-        };
-        let amount = match arg!(args, 1, "amount").eval() {
-            Value::Dimension(n, Unit::None) => n,
-            Value::Dimension(n, Unit::Percent) => n / Number::from(100),
-            _ => todo!("expected either unitless or % number for amount"),
-        };
-        Some(Value::Color(color.fade_in(amount)))
-    });
-    decl!(f "transparentize", |args, _| {
-        let color = match arg!(args, 0, "color").eval() {
-            Value::Color(c) => c,
-            _ => todo!("non-color given to builtin function `transparentize()`")
-        };
-        let amount = match arg!(args, 1, "amount").eval() {
-            Value::Dimension(n, Unit::None) => n,
-            Value::Dimension(n, Unit::Percent) => n / Number::from(100),
-            _ => todo!("expected either unitless or % number for amount"),
-        };
-        Some(Value::Color(color.fade_out(amount)))
-    });
-    decl!(f "fade-out", |args, _| {
-        let color = match arg!(args, 0, "color").eval() {
-            Value::Color(c) => c,
-            _ => todo!("non-color given to builtin function `fade-out()`")
-        };
-        let amount = match arg!(args, 1, "amount").eval() {
-            Value::Dimension(n, Unit::None) => n,
-            Value::Dimension(n, Unit::Percent) => n / Number::from(100),
-            _ => todo!("expected either unitless or % number for amount"),
-        };
-        Some(Value::Color(color.fade_out(amount)))
-    });
-}
+}
\ No newline at end of file
diff --git a/src/builtin/mod.rs b/src/builtin/mod.rs
index 82e9393..3cb388f 100644
--- a/src/builtin/mod.rs
+++ b/src/builtin/mod.rs
@@ -9,7 +9,6 @@ use crate::value::Value;
 mod macros;
 
 mod color;
-mod color_hsl;
 mod list;
 mod map;
 mod math;
@@ -23,7 +22,6 @@ lazy_static! {
     pub(crate) static ref GLOBAL_FUNCTIONS: BTreeMap<String, Builtin> = {
         let mut m = BTreeMap::new();
         color::register(&mut m);
-        color_hsl::register(&mut m);
         list::register(&mut m);
         math::register(&mut m);
         meta::register(&mut m);