Changed page width, how do I change it back?

Hi all,

I just started working on changing a few things around in the AutoFocus+ theme and things have worked out really well so far. The only thing is, I noticed now that my page is wider than before. There is a scroll bar at the bottom of the pages to scroll left and right. I don’t remember messing with anything that would change the overall page width. I did edit the size of pictures to be 800px as well as the text content of the blog to be 800 px as well.

It would be very helpful if someone could point me to the code that I need to change in order to make my pages not scroll. I’m sure it’s a margin/padding thing, but I don’t know where those are. Any help is appreciated!