Thread:Project:Support desk/CSS - Pages have moved to 0px and I can't change the Common.css/reply (4)

There is no file that you can get at for MediaWiki:Common.css.

However, you have css files that you can get to on disk. In your installation, if you edit the file at http://www.wheelsofitaly.com/wiki/extensions/SlimboxThumbs/slimbox/css/slimbox2.css and add #content { display: block !important; } to the top of the file, you should then be able to reload a page and get at your Common.css on-wiki and edit it to fix the problem.