Background color not showing up

I configured my theme to have a background color applied. It worked earlier last week just fine, but on Friday I noticed that the background color is showing up as white. When I go into the area to configure the theme, the background color I had applied is still there, it's just not showing up when I view the site.

Any ideas? The site is renttim.mit.edu and the background color should be #e2dab1.