Help talk:Username

How to change username color?
I've tried changing it but it only stay as the original. How do I fix this. a[href="/wiki/User:TalkingOddlySpooky"]{ color:#000080; font-weight: bold; font-family: Arial Black; a[href="/wiki/User:TalkingOddlySpooky"] { background: url(<>) center left no-repeat; padding-left: 17px; }