Board Thread:General Discussion/@comment-1380999-20200418042025/@comment-44807868-20200418043111

Your wiki is using UCP, which currently has a bug which's preventing CSS customization. It'll likely be resolved soon, though, so keep an eye out! You can check on Board:Technical Updates for relating updates.

Edit: Forgot to mention, not really on topic but I don't recall any instance of CSS shutting due to security reasons? Mind elaborating on this? I know there were security issues concerning JS long ago, but I don't remember anything relating to CSS.