Navbar and Background HELP.

Hello there, I am almost completly new to CSS and want to get some problems solved as quick as possible.
I'm a graphicer, designing a webshop with graphics and so on, we are currently using a platform to host our webshop and it has some easy feauters such as: Upload file/image, Create new page with articles, upload price and much more. Well my point is that this platform gets most of the job done.
However I have created a navigation bar on this platform and now I want a clean hover and marked function for it.
The navbar is located in this section:

Expand width in half page

Hello.. I think i need some help..

It is a bit hard to explain, so i think it is easier to visit my site to find out the problem..

my site is:

open a random product.. and look down for product description... I want to be able to display the product description on all the page content, not just in the middle.. if you know what i mean..

Thanks for your help guys!


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