Board Thread:Support Requests - Getting Technical/@comment-30558056-20201001004254/@comment-9605025-20201002210327

Well, that is all of the infobox CSS I could get out of the old global CSS so I am not sure what else it could be unless you removed some local CSS as well. But I am guessing you didn't remove any local CSS. The other thing I don't understand is where the rounded corners would have come from. I don't see it neither in your local CSS nor the global CSS. One thing I noted is that you may need to add ".mw-parser-output" to the beginning due to the new global CSS. So anywhere you start with ".infobox" it would be ".mw-parser-output .infobox" instead.