Board Thread:Support Requests - Designing Your Wiki/@comment-3234315-20190625092959/@comment-39313796-20190625110011

The sample in your post looks fine to me and works in devtools. When you previously tested it in your personal css, did you try appending  to the end of the URL you were looking at (that of the infobox)? I find that even hard-refreshing doesn't get css to update reliably, so I use that to check quickly.

Regarding the "Don't use adjoining classes" warnings, I ignore them; as far as I know, it's the only way to have selectors specific enough to override the portable infoboxes' styling, and it's what the guides here advise anyway.