Board Thread:Support Requests - Designing Your Wikia/@comment-5785681-20141207014155/@comment-5939974-20141214185007

"Fix" means the background image stays put, and doesn't repeat itself horizontally when you scroll down. For example, the Community Central's background is fixed. The CSS "no-repeat" rule does exactly that, too. I find the lack of on-site image adjustment a bit tacky, though, so if you're really trying for a good look for your wiki, keep uploading and cropping until you find a good match. All I can say is good luck, and keep trying!

PS: Thanks for the CSS alternative, Rider!