MediaWiki talk:Common.css

Anybody willing to help out?
I'm an administrator at Robot Wars Wiki, and we were wanting coloured usernames for administrators and bureaucrats in Recent Changes, so I've put some coding into Common.css which I originally took from this wiki's Common.css, having seen coloured admin/bcrat links on this wiki's Recent Changes. Unfortunately, it doesn't appear to be working. Can anybody see an immediate problem? 

If this is a bad place to ask, then my apologies, but hopefully someone is willing to help. Toast Ultimatum  17:15, September 27, 2012 (UTC)