diff --git a/after/syntax/css/css3-colors.vim b/after/syntax/css/css3-colors.vim
index baf843b..fcb55de 100644
--- a/after/syntax/css/css3-colors.vim
+++ b/after/syntax/css/css3-colors.vim
@@ -1,2 +1,3 @@
+syn region cssFunction contained matchgroup=cssFunctionName start="\<\(rgba\|hsla\=\)\s*(" end=")" oneline keepend
 syn keyword cssColorProp contained opacity
 syn match cssColor contained "\<currentColor\>"
diff --git a/after/syntax/css/css3-functions.vim b/after/syntax/css/css3-functions.vim
index 5f84539..dec1599 100644
--- a/after/syntax/css/css3-functions.vim
+++ b/after/syntax/css/css3-functions.vim
@@ -1 +1 @@
-syn region cssFunction contained matchgroup=cssFunctionName start="\<\(rgba\|hsla\?\|calc\|\(linear\|radial\)-gradient\)\s*(" end=")" oneline keepend
+syn region cssFunction contained matchgroup=cssFunctionName start="\<\(calc\|\(linear\|radial\)-gradient\)\s*(" end=")" oneline keepend