How to add background only on left/right sides in responsive theme

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I'm using the responsive theme. I've got an image set as my background, but I only want it showing up on the left and right sides of my site where there's no content. I want the center of all the pages to be white. My site is


I added the background image to the whole page then tried adding this to my CSS:

.container {
	background-color: #fff; 

This got me what I wanted, except it also added a white background behind the text in my banner & the text in my pink footer.


So currently I just have this in my CSS:

.container.content {
	background-color: #fff; 

This helped a little by getting the white behind my logo and the navigation, but the background is still showing everywhere else.


Any ideas?