Board Thread:Support Requests - Getting Technical/@comment-5878748-20121216191311/@comment-188432-20121216203522

Just copying the text of w:c:harrypotter:template:muggle individual infobox ain't gonna cut it. This template — like any good, modern infobox — is mostly created through CSS class calls.

So unless your MediaWiki:Common.css (assuming you want the infobox to be visible in both the Wikia and Monobook skins) contains definitions for every single thing referenced by, the infobox won't work. So your CSS file needs to have definitions for: .infoboximage .infoboxheading .infoboxlabel .infoboxcell .infoboxsubheading .infoboxfooter (I think that's it, but I might have missed one.)