background color for Top1 or Top2 positions on full page

Hi
I was considering using Game News template on a new site.
But, to customize it I would need to add a background color/image/pattern only for some positions (for example, Top1 or Top2, maybe MainMenu).
The thing is that I want the background color to be applied on the full width of the page (and not only limited of the width of the PageContent).
I was not able to do it with Firebug (only was able to change within the PageContent).
Is it possible using only CSS or should I try differently ?
Thanks for the help.

Hi

This would require to change a structure of a template. Unfortunately it's too big customization, we cannot support such.