Unable to theme two areas

Hi,

I am playing around with this theme and have been trying to theme it in such a way that some of the body background is visible through parts of my page. Because the container div is positioned where it is, top (above the leaderboard region) to the bottom (below the footer region), I can achieve this by making the container background and the areas I wish to have the body background showing, transparent. Well sort of, I have a problem in that there are two areas one under the "leaderboard" region and the other under the "secondary content" region that I cannot place a background colour onto, these two areas always show the container div's background colour setting. This problem only seems to affect these two areas, the "Tertiary Content", "Footer" and "breadcrumb" regions or wrappers seem unaffected.

I have attached a picture site_snip_1.png (excuse the colour scheme) to show the affected areas, the "Leaderboard" is in pink and the "secondary content" is in green, the two white areas are the container colour and around it all, the container background is in pale pink.

What are these two areas and how can I theme/colour them ?

Thanks

Dave