Thread:King Dragonhoff/@comment-7964552-20170405154517/@comment-24531999-20170405183505

Yes, the only way to create and modify CSS rules is by changing a CSS file like Wikia.css in the MediaWiki namespace. However, the clickable-div class on the NavButton just makes the element work like a button. All of the visual CSS for it can be changed by editing the contents of its style attribute on Template:NavButton.