jerryskate on "Make background div push post content down"

I wonder if it would be possible to make superzised push down the main container so content will be hidden? Tried fiddling with z-index but no luck. This is my testsite: http://www.svenssonsbild.se/Baronen/?page_id=103

I would like to place the video and anything else posted below the background image. I got the page to fill just the browsersize regardless of height, so now i need to place the maincontainer below the background.