diff --git a/after/syntax/css/transforms-1.vim b/after/syntax/css/transforms-1.vim
index 7b35e2f..1969b72 100644
--- a/after/syntax/css/transforms-1.vim
+++ b/after/syntax/css/transforms-1.vim
@@ -1 +1 @@
-syn keyword cssFontAttr contained flat
+syn match cssFontProp contained "\<transform-box\>"
diff --git a/test/test.css b/test/test.css
index be652f5..6488a8a 100644
--- a/test/test.css
+++ b/test/test.css
@@ -1010,7 +1010,7 @@ view {
 }
 
 .transforms-1 {
-  display: flat;
+  transform-box: auto;
 }
 
 .transitions-1 {