Width of the blog page

[Jonathan1234567]

I screwed something up on my website causing the width of the blog page to shrinken massively. While editing the site it is the size that I want, but when I go into the code and preview my site, it shrinkens down. Currently on my website, it is how I want the width of my blog page to be. 

Please let me know if you can help out. Thanks

Website: jonathanshedd.com

[Adam7]

We can't assist with custom theme coding, although I took a quick look at your templates and the pink highlighted </div> tags at the bottom of your header.html template suggests you've got some errors in your template html. I'm guessing something is nested wrong, opening tags with no closing tags or vice versa.