Make sure you have the Xtreme Theme Support PLUGIN installed with latest version 5.02
Make sure to clear all your caches.
Go in Appearance > Xtreme Admin > main Options and click “Save Settings” to refresh everything.
Right now I am seeing an overall background (outside the wrapper) set to dark grey and the content area BG is set to white in the theme.
If these are not what you setup, please be specific about what your settings are on each area with a problem