diff --git a/after/syntax/css/color-5.vim b/after/syntax/css/color-5.vim
index ae741ba..93617d4 100644
--- a/after/syntax/css/color-5.vim
+++ b/after/syntax/css/color-5.vim
@@ -1,4 +1,4 @@
 syn keyword cssFontProp contained components
 syn keyword cssFontAttr contained relative-colorimetric absolute-colorimetric perceptual
-syn region cssFunction contained matchgroup=cssFunctionName start="\<color-mix\|device-cmyk\s*(" end=")" contains=cssCustomProp,cssFunction,cssColor,cssFunctionComma oneline
+syn region cssFunction contained matchgroup=cssFunctionName start="\<\(color-mix\|device-cmyk\|light-dark\|contrast-color\)\>\s*(" end=")" contains=cssCustomProp,cssFunction,cssColor,cssFunctionComma oneline
 syn match cssFontDescriptor "@color-profile\>" nextgroup=cssFontDescriptorBlock skipwhite skipnl
diff --git a/test/test.css b/test/test.css
index 8b46456..3f00cc9 100644
--- a/test/test.css
+++ b/test/test.css
@@ -100,6 +100,8 @@
 .color-5 {
 	display: device-cmyk(0, 81%, 81%, 30%);
 	display: color-mix(red yellow 65%);
+	display: light-dark(white, black);
+	display: contrast-color(red max);
 }
 
 @color-profile swopc {