Changin CSS on MediaWiki

I've been tweaking CSS files on mediawiki/skins/ to align table and pre the way I like. Today, I just found that I can edit CSS files within MediaWiki from the web browser.

If you want to change CSS on any MediaWiki skins, then go to MediaWiki:Common.css and enter new CSS. But make sure to put between these tags:

/*<pre><nowiki>*/
/*</nowiki></pre>*/