How do I change the background of my header without changing the header image?

My website is provensweets.com. I have already figured out how to center and upload my website header through the theme options. However I really want to add a background image that will go behind the header image. The only coding I could find that even changed the background is : #branding { background-color : #D4D496; } .widget { background-color : #D4D496; } but the image I want in place of those colors is : http://provensweets.com/wp-content/uploads/2012/09/Untitled-6.jpg Can anyone help me with this?