diff --git a/data/plugins/language_css.lua b/data/plugins/language_css.lua
index 021c5d33..9ea3d0d3 100644
--- a/data/plugins/language_css.lua
+++ b/data/plugins/language_css.lua
@@ -9,7 +9,8 @@ syntax.add {
     { pattern = { '"', '"', '\\' },   type = "string"   },
     { pattern = { "'", "'", '\\' },   type = "string"   },
     { pattern = "[%a][%w-]*%s*%f[:]", type = "keyword"  },
-    { pattern = "#%x+",               type = "string"   },
+    { pattern = "#%x%x%x%x%x%x%f[%W]",type = "string"   },
+    { pattern = "#%x%x%x%f[%W]",      type = "string"   },
     { pattern = "-?%d+[%d%.]*p[xt]",  type = "number"   },
     { pattern = "-?%d+[%d%.]*deg",    type = "number"   },
     { pattern = "-?%d+[%d%.]*",       type = "number"   },