Board Thread:Support Requests - Designing Your Wiki/@comment-36535642-20191228142729/@comment-9605025-20191228193535

I don't think the provided CSS would be an issue as far as customization policy is concerned. All of the selectors are set to either the main content, rail or redlinks; so things like the header shouldn't be targeted by any of it.

However, you are still correct in that  should be avoided if possible.