Board Thread:Support Requests - Designing Your Wiki/@comment-32849916-20170819144531/@comment-4347751-20170819145443

All of the styling for infoboxes are done through CSS. You'll need some kind of CSS knowledge in order to modify their design, but if not, you can probably just do a Google search for what you're looking for and append it to the infobox using the selectors. You can find more information here.

There are also a few blogs floating around on this wiki about customizing the infoboxes, and a few over at Portability Wiki.