Forum:How do you change background color "outside" a wiki?

I would like to know how to change the background color at the very left of the page and at the top, where the widgets are. Every big wiki site seems to do just that. Ex: http://www.wowwiki.com/Portal:Main. Thanks in advance. ConcombreMasque 11:35, September 25, 2009 (UTC)
 * You should be able to find the info you're looking for at Help:Customizing Monaco. -- Porter21 (talk) 12:02, September 25, 2009 (UTC)
 * Merci! Thank you! ConcombreMasque 01:43, September 26, 2009 (UTC)