Background problem

Hello,

Im using Background Manager plugin and Fluxipress theme on http://www.gry-mmo-rpg.pl/witaj-swiecie/

How can I change post, sidebars and other pages background to white for example with no opacity.

I guess its something in style.css but I dont know where to look.

This is the color setup of theme: http://postimg.org/image/46c2wvgcb/ but it apply only for the frong page.

Thanks !