Board Thread:Support Requests - Designing Your Wiki/@comment-24109466-20131126180809/@comment-168424-20131203202658

If you look at w:c:ninjago:MediaWiki:Wikia.css, here is the likely relevant CSS: section#WikiaPage { border: none; background: url("http://www.majhost.com/gallery/Meiko/TNW/dragon.png") no-repeat scroll 0px 0px white; } .you { background: rgba(249, 249, 249, 0.25) }

Try using it and put the appropriate image URL you want in place of the dragon one.