Sorry, couldn't think think of a better title (there has to be a name for that page).
Alright. So, when a user tries to view the posts index on Danbooru without being logged-in, this page is presented to them:
http://trac.donmai.us/attachment/ticket/1075/left.png
Frankly, I think having it aligned to the left, coupled with the "Upgrade your account banner", just makes it look really wonky. My suggestion would be to move the page's content (only for that specific page, of course) so that it's aligned to the center, rather than the left.
I hot-edited some styles in the page, and changed the alignment so that it's in the center. This is what it looks like with that change:
http://trac.donmai.us/attachment/ticket/1075/center.png
Anyone think it would look better that way? Thoughts?
Updated