CSS with MediaWiki is done via
There are other files in
skins/monobook/, and stylesheet files in
skins/common/ as well.
this won't show, but it's searchable!
Existing links ∞
2018-05-22 - I'm not sure what this all is, so I'm going to wrap the raw content into a code block.
It was located at
[[CSS/existing links]], where CSS was just a regular page. It was from 2006-09-24 or earlier.