Thread:Project:Support desk/How to add custom CSS via LocalSettings.php (2)/reply

Why should that no longer be possible? You can add/change CSS in the usual ways, e.g. using the page MediaWiki:Vector.css for the Vector skin.

(Another option would be to define an own ressource loader module in LocalSettings.php, but doing that just to add a CSS file is like cracking a nut with a sledgehammer.)