Subject: Please mark invalid "; !important;" in CSS

From: Lennart Borgman <[email-masked]>
Date: Sat, 28 Jan 2012 23:01:50 +0100

One of my most common mistakes when editing CSS files is that I leave
a ";" before "!important", like this:

   width: 500px; !important;

This should have been

   width: 500px !important;

Could Emacs please help me with this?;-)