[Victor D]

You need it's height to be 100% of the page?
As it is floated it won't gain 100% of the page content.


But you can specify background for content-container div since it wraps the center of the page put there image with the width equal to your left column width.
Also you should specify background for footer.
If you are used content-container's background already you can nest in it another div and place background on it.