Board Thread:Support Requests - Getting Technical/@comment-3474513-20130422090712/@comment-3335785-20130423085140

The code looks fine, but there's a problem with using it on Wikia: The background-image attribute is unsupported to prevent insertion of malicious links.

You may want to use the background attribute instead which will take much the same argument. This goes in your MediaWiki:Wikia.css or MediaWiki:Common.css and is simply added to your page every time there is a link.

Edit: missed on one page only. See w:c:dev:CSS Cookbook for help on that.