Here are all the codes I've added in the Extra CSS Styling section of Look and Feel:
Once in a great while, I'll have to manually edit one of these, due to the creator of the file using something like "nonindent" for all paragraphs, but this doesn't happen very often, so it still saves tons of time having these extra CSS codes added into the conversion. Once in a while, Calibre does not honor one of these, and like I've previously said, it's usually the "justify" line in the "calibre" class.