User blog comment:Davidchola2/On the Renovation of the Website's Visuals: Part I/@comment-24318364-20151004143850/@comment-4097945-20151004144742

All wikis have customizable files, Wikia.css, Wikia.js, Common.css and Common.js are examples of those. I'm not a coder, although I do understand how to use some code from picking up bits and pieces from various wikis. Editing those pages can make lots of things: the administrators' coloured comments are coded there, and so is the chat background. The Recent Activity's 60-second refresh is in one of those pages, and, if you want to place a header, you have to add code there too. Some wikis edit those files to bypass Wikia limitations: they write code that overlays the base background with the image they choose, without needing to be 300kb, although I think it doesn't adjust in shape as regular backgrounds.

Currently, I'm editing one of my fanon wikis to test some code that allows you to use images and make them backgrounds for tables. It's coming out really well, and I might suggest using it here in the future.