CMS CMS layout - widgets/body size
 

I checked the CMS page of this site and of my site with Firebug.

This site has things named yui-b, yui-sidebar.

I have nothing in my CMS named like that.

What is this?

The reason I ask is because I want my CMS to have wider widgets and I can't figure it out. Changing the width from it's current 170px just makes it smaller believe it or not.