background body position problem

[markdunbavan]

Hello. My name is Mark.

I am trying to develop a website that utilises a background that has a divide in it. The top half will be white and the other will be grey #ccc.

What I am trying to create is a background that works with the website so when the page is changed the body bg moves with the nav bar.

I have attached an image of how I am working at it at the moment but I cannot get it to work for the life of me at all.

Any tips would be amazing!!

Thanks

Mark