Change body style on editor

I have setup CKEditor to load a custom stylesheet. In that stylesheet the BODY tag is set to have a background image and the text is centrally aligned.

I am using CKEditor to edit a small section of a web page that uses this stylesheet but the editor is displaying the background image and is centrally aligning the text. I only want it to pick up the styles which are relevant to the content I'm editing. I want the editor to left align the text and show a white background.

I've used TinyMCE before and by adding a line which referenced the body area of the editor I was able to do this. Is there a similar option for CKEditor as I can't seem to find one...

Thank you