CSS Changes to padding and background colour

I need some help changing
1) the colour background of this area on the product pages - http://take.ms/gewwF
2) adding some padding to the bottom of the page on all pages to cover the cloud graphic and ensure user can view the page correctly (please can this only be changed on Display over 480px so that it does not affect mobile devices?)

Domain: http://tinyurl.com/zu9rz78
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