Image in background??

Can i just ask how you got the background image within this table. The bit i mean is the white background with little grey logo's. could you tell me which templates i have to edit to get the background in all the post bits and that. As when i try it gets split.

As this makes no sence to anyone except me here is what i mean i have attached a picture.

Mine gets spliut up and leaves gaps everywhere so its basically i would like to know how to get rid of the gaps if possible. Thanks.