Board Thread:Support Requests - Designing Your Wiki/@comment-2177054-20171024143410/@comment-27345308-20171024145440

The policy says you're not allowed to change anything in the page header through CSS aside from adding new options in the edit dropdown and adding icons next to interlanguage link dropdown. You can change them, but if Staff notices you changed them they are likely to remove your customization. You can also contact Staff to ask if a specific minor change is allowed.