User blog comment:BertH/Fluid layout is arriving on December 4/@comment-1192804-20131204134019/@comment-1192804-20131204141514

I don't think that's necessary. Well, I'm looking at Resident Evil Wiki as an example, and the background there seems to be working. I'm trying to get it working on Silent Hill Wiki.

body { background-image: url("http://static1.wikia.nocookie.net/residentevil/images/thumb/f/fa/Resident_Evil_Revelations_wallpaper_-_Mountains.jpg/1800px-Resident_Evil_Revelations_wallpaper_-_Mountains.jpg"); background-position:top; background-position:center; background-repeat:no-repeat; color:#FFFFFF; background-attachment:fixed; background-size: contain }

So my first thought was to change "background" to "background-image". I think it may work.