Board Thread:Support Requests - Getting Technical/@comment-35086773-20200707225012

Hello, I’m an admin on the Lookism Wiki and one of the admins on that wiki (That is not me) is wondering if she would like to copy the Navbox from this wiki https://megamitensei.fandom.com/wiki/Thread:58792 but the coding used for that Navbox didn’t work for the wiki So I’m wondering, Is the CSS Not working https://lookism.fandom.com/wiki/MediaWiki:Wikia.css so my question is, is there a way to implement Theme.css to the Mediawiki so the Navbox could look like that? 