[SOLVED] Problem with background image

Hi,

Hoping someone could help me - when I use a background image, it fills the blank space to the left and right of my page (I'm using a fixed width). However, it also becomes the background for body text on pages and posts. I'd like the background image to only appear in the blank space at the edges, nowhere else. I've tried unsuccessfully to re-add white backgrounds in various places (e.g. ATO:center column style, ATO:style posts and pages) - but the background image seems to overwrite them / I've missed the obvious somewhere.

Grateful for all and any help.

Regards, Anthony.