You can change that in your personal CSS if you're logged in. Go to Special:Mypage/common.css on any MediaWiki site to do this. See Help:Customizing skins.
Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.