How to increase this theme's content and overall area width?

Currently i am using a theme called combine by newpthemes.com theme is working perfectly but if i can increase width of content/post area so it would be look more batter i tried by myself but no success if anyone help i will be really grateful to you
this is the theme i am using http://newwpthemes.com/demo/Combine/

width:100%;

width:1000px;