Css in mainbody as module

Hello

I try to put module News Show Pro GK4 in mainbody position with suffix " alpha" . But I still have css form the mainbody (white background) . How to turn of mainbody from the main site ?

( I known there is few ways to do this but is there options in template ?)

Please use for the homepage the nobg page suffix (you can set it in the template options at the "Features" tab).

Thank you