Lost padding on the left and right sides?

After installing some plugins and then uninstalling them, I’ve lost the padding on the right and left side of my pages. My content was in the middle of my page and now has floated to the left. The same has happened to my right sidebar. It has now floated to the right of the page. I have attempted to change the layout settings, but this doesn’t help. I want them back in their original positions.

My site is VegRunChat.com.

Any help would be great as I’m a rookie to WordPress.