User blog comment:Ducksoup/The Future of Infoboxes on Wikia/@comment-4899461-20150823124157/@comment-2240397-20150824154640

Hi, we have a feature called infobox themes which allows adding custom classes to infoboxes based on template parameter values. It is described here: Help:PortableInfoboxes.

I'd suggest adding it to infobox and modifying css to match the new classes (probably just adding a prefix). Please let me know if you would need an example or any kind of help.

Cheers