Board Thread:Support Requests - Designing Your Wikia/@comment-26423859-20150516034951/@comment-24757753-20150516163441

.WikiHeader > nav li.marked > a { color: #fff; } is what you're looking for.

It's best not to use '!important' unless necessary. The easiest way to figure out a good selector is to use your browser developer tools and see what selector Wikia's using. See the picture for example - hope this helps next time!