Post Content Not Centering.

if you go to sneaknsnap.com and scroll down on any page… you can see the content is not centered as i made it. The box is automatically huge and drawn out to the right.. on a cell phone it looks fine but on a computer its awful. I can’t find anyway to make the box shrink down. If you look at the post testestest the photo is all the way to the left and the box is extended a ton to the right. Im hoping someone can please help me before I lose my mind