Board Thread:Support Requests - Designing Your Wikia/@comment-24173435-20160927181901/@comment-3508553-20160927191416

Here!

body.mediawiki { background-color:#000000; background-image:url("http://vignette4.wikia.nocookie.net/fated-charmed-the-next-generation/images/8/8f/Season_One_Wikia_Background2.jpg"); background-repeat:no-repeat; }

This oughta do the trick!