Board Thread:Support Requests - Community Management/@comment-1999323-20130621034204/@comment-4674838-20130622164156

Some wikis use JavaScript to add extra links to the "On the Wiki" menu, or, when restyling, use some CSS to hide links they don't like. Things like that are not allowed, which is what he was probably referring to.

There is a Customization Policy and the Terms of Use that do in some ways govern what types of customization you are and aren't allowed to do on Wikia.

As long as your navigation functions the same way as the normal one (despite looking a bit different due to CSS styling) that's probably fine. It's when you start messing with the functionality that you might be doing something you're not supposed to.

In this case, I don't think you've done anything wrong, so I wouldn't be worried about it.