Board Thread:Support Requests - Getting Technical/@comment-9336282-20160701030101/@comment-1251315-20160703211625

Changing the colour of the wiki navigation bar is quite likely to be a violation of the customisation policy and you should not put such CSS into the wiki's CSS file. You can do it in your personal CSS files (ie global.css on Community Central, or through Special:MyPage/wikia.css or Special:MyPage/common.css on the respective wiki's), but not in wiki-wide CSS pages.