Width page

Hi,

I don’t understand why I have this white space at the right side of my pages. http://imgur.com/KugmP4U
It’s not a zoom browser problem, refresh or ctrl+0 don’t change a thing.

If possible, I would like to know how to have the same behavior than this website http://priyoneer.com/
On this one, zoom in or zoom out won’t let appear the white space.

Thank for your time