Center content on page with sidebar active?

I see that version 1.1.6 released on 7 February fixed a bug: "Sidebar issue when main sidebar inactive." Not sure if this was the issue resolved, but I actually preferred to have my content centered on the page with margins on either side. I don't want to make my content full width. Is there a way to get my content to be centered on the page like it was before? (Not centered text alignment - just a narrower column in the center.) My website is sterlingschuyler.com Thank you!