Board Thread:Support Requests - Getting Technical/@comment-1365289-20151002143635

Are there any good tutorials anywhere for adding CSS for the new infobox system?

I've read through this already: http://community.wikia.com/wiki/Help:Portable_infoboxes/CSS but much of it is still beyond me.

I want to figure out how to add borders, center headers, change a few font sizes, and change background colors to some templates.  