add browser warning

static/languages/code_css.json

@@ -0,0 +1,40 @@
+{
+  "name": "code_css",
+  "leftToRight": true,
+  "noLazyMode": true,
+  "words": [
+    "background-color",
+    "color",
+    "center",
+    "font",
+    "font-size",
+    "font-family",
+    "text-align",
+    "float",
+    "align",
+    "width",
+    "height",
+    "padding",
+    "margin",
+    "solid",
+    "border",
+    "display",
+    "inline",
+    "block",
+    "max-width",
+    "auto",
+    "position",
+    "srcset",
+    "z-index",
+    "left",
+    "top",
+    "overflow",
+    "border-image",
+    "background-image",
+    "background-clip",
+    "background-size",
+    "background-origin",
+    "transform",
+    "@media"
+  ]
+}