Update sample css file.

styles.css

@@ -1,4 +1,8 @@
-/* Sets all the text color to red! */
+/*
-body {
+
-    color: red;
+This CSS file will be included with your plugin, and
-}
+available in the app when your plugin is enabled.
+
+If your plugin does not need CSS, delete this file.
+
+*/