diff --git a/packages/styles/package.json b/packages/styles/package.json
index a012ecabaab2..dc1603d4a5f4 100644
--- a/packages/styles/package.json
+++ b/packages/styles/package.json
@@ -56,6 +56,7 @@
   "sideEffects": [
     "index.scss",
     "scss/**/*.scss",
-    "scss/**/*.css"
+    "scss/**/*.css",
+    "css/**/*.css"
   ]
 }