Hiding Sidebar in Custom 404 Error Page

I’m using the Magazine Premium theme and setup my own custom 404 page. There are two issues I’m having, and I am not getting any help from the author of the theme, so I thought I would ask for help in the forum.

The h1 and h2 are aligned to the far left of the page while the remaining portion of the page is properly aligned with the correct indentation. I’m not sure how to get these moved over.

More importantly, I can’t seem to hide the sidebar nor lower sidebar. I only want the footer to be displayed. I use Jetpack and marked all the widgets to be hidden on 404 error page but that did not work. The bottom of the page I have get footer but not sidebar, yet it’s still pulling it anyway. This is causing a massive gap between the page and the footer.

How can I get this properly aligned and hide the sidebars? Any suggestions would be greatly appreciated. You can view the page here