Thread:Project:Support desk/Trying to adjust sidebar width in vector

Hey there, I'm trying to make the sidebar on my wiki wide enough to accommodate the adverts - right now the ads creep onto the main content area and cover up some of the text. I've tried adding the following snippets of code to http://lostforeverwiki.com/index.php?title=MediaWiki:Vector.css with no effect on the site:

From http://www.dokuwiki.org/template:vector?#customizing div#content, div#head-base, div#footer { margin-left: 12em; } div#panel { width: 12em; }   left: 12em; }
 * 1) left-navigation {

From http://www.mediawiki.org/wiki/Manual:Interface/Sidebar#Sidebar_width_in_Vector_Skin_.28CSS.29 div#mw-panel {width:12em;} div#footer, #mw-head-base, div#content {margin-left: 12em;} From http://www.mediawiki.org/wiki/Extension:Google_AdSense_2
 * 1) left-navigation {left: 12em;}
 * 1) content, #footer { margin-left: 11em; }
 * 2) left-navigation { left: 11em; }

I've tried all of these, pressing ctrl+f5 every time (I'm using Firefox), and I haven't seen the layout change once. Here's the info on my wiki:

http://lostforeverwiki.com

Mediawiki 1.18.1

PHP 5.2.17 (cgi)

MySQL 5.0.92-community

Please help, I'm tearing my hair out over here.