Board Thread:Support Requests - Designing Your Wiki/@comment-3990525-20130503035945

Ok so I've been searching a lot about it and i can't figure why it didn't work. I added this like to my monaco.css page and it does nothing. Can anyone help me?

.color2 { background : #000 url ( http: //images.wikia .com/dungeonstriker/images/f/f6/Background12.jpg) ;  