User blog comment:KolakCC/wikia.js and wikia.css/@comment-1915726-20110922221837/@comment-1913729-20110923023550

It's the same code that changes the regular background and text color, however, you have to go to the community wikia page and change your global.css (or your global.js, if you want). Thi overrides any css (or js) code and is implemented first.

You can go here and here to learn more about changing them

Monchoman45 has made a blog page that lists a ton of changes you can add to your css/js pages to change the way wikia looks to you. I think some might be a little outdated.