diff --git a/after/syntax/css/css3-background.vim b/after/syntax/css/css3-background.vim
index fb4cde0..60613cc 100644
--- a/after/syntax/css/css3-background.vim
+++ b/after/syntax/css/css3-background.vim
@@ -4,3 +4,4 @@ syn match cssFontProp contained "\<border-image\(-\(source\|slice\|width\|outset
 syn match cssFontProp contained "\<border-\(\(top-right\|bottom-right\|bottom-left\|top-left\)-\)\=radius\>"
 syn match cssFontProp contained "\<box-\(decoration-break\|shadow\)\>"
 syn keyword cssFontAttr contained stretch round fill alice clone
+syn match cssFontAttr contained "\<\(padding\|border\|content\)-box\>"