Looks like you changed the “body” background to #fff (white) so that’s why its showing up like that. As you can see here – http://demo.appfinite.net/epik/ the body background is #f2f2f2 which covers the main background. If you add that back it will show up. If you wanna make certain parts white, you would have to individually style it.
Let me know if that helps.
