Adding CSS or JS file to MediaWiki?

Question

I\'ve been following some tutorials at mediawiki.org but I didn\'t make it. I need to add a new CSS or JS code to be available in all my wiki (basically be cause I need to a

Answer 1

In my experience, I had to modify the /skins/Vector.php and /skins/vector/main.css files. Could you explain in more detail what are you trying to do?