Unwanted border on fullwidth 404 page

Hello people,

I am customizing the 404 page on my site and found the topic set-404-error-page-to-full-width. I have made those changes to the code of the 404.php file but now there is an unwanted border on the right. When I inspect the elements of page in Chrome it seems that the class ´content´ is the cause of this border. Any idea how to solve this? When I remove the content class the border dissapears but the padding also dissapears.

Regards,
Erik