Thread:Menyyearsago/@comment-22439-20130228014032/@comment-4842859-20130302002633

You can change the css settings of your wiki by editing your wikia.css file (found at yourwiki.wikia.com/wiki/MediaWiki:Wikia.css).

Do note that these changes can potentially 'break' parts of your wiki if not done correctly, and are a more advanced feature of wikia. Only edit the css if you know what you're doing.

In the future, it's generally best to ask these kinds of questions from the Community Central wikia to get quick and accurate results.