Change Background Color

Hi, you’d think this would be a simple fix, but I can’t figure out how to change my site’s background color.

Here is the site: http://www.pinkfloydonline.com

It’s got a grey background right now, and I want to change it to blue.

Here is the stylesheet:

[CSS moderated as per the Forum Rules. Please just post a link to your site.]

But when you refresh the page, it only temporarily “flickers” the color, then goes back to grey.

Is it using a background image on repeat and I just don’t know where possibly?

Or any other ideas?