background question contempory theme

[wesleythorne]

A quick easy question for someone i hope!
How can i change the background colour that surounds the whole site as done on http://www.hunterspuddings.co.uk/

They have a light brown background instead of a standard white page.

I see in advanced theme and colours I can change most colours but not the overall white space the web browsers give you when viewing a site.

Thanks
Wesley

[Duncan Rounding]

Some css. You will see this in the html:
body {
background-color: #996633;
background-image: url('acatalog/theme_main_background.gif');
background-repeat: repeat-x;
}