Board Thread:Support Requests - Designing Your Wikia/@comment-24045678-20151022083731/@comment-23989026-20151022095117

This is how I do it...

I add the background to MediaWiki:Wikia.css using its vignette name. So if it is given a classname of frame it would be .frame { background-image:url('http://vignette3.wikia.nocookie.net/warhammerfb/images/e/e4/Front-Page_Screen.png'); }

As the frame is a fixed size, width and height is specified with the class in the template