Board Thread:Support Requests - Designing Your Wiki/@comment-32092932-20180210173852/@comment-9605025-20180210175947

Well, it really depends on what you want to do. You asked generically which is what the help page provides. I also provided two actual examples in case you want see them somewhat in action. If you want help with your specific case, you would need to provide more information such as which wiki it is for and what you want it to look like (perhaps with examples of similar designs from other wikis, if you have any).

"ul.tabbernav" is not a class; "tabbernav" is. If you are unfamiliar with CSS selectors, I suggest you read this and this. With regards to Tabber, the classes for the outer-most HTML element are "tabber" and "tabberlive". For the children elements:
 * tabbernav
 * tabberactive
 * tabbertab