Single post in Guide to CSS (Beginner & Intermediate) [In Progress]

Can't do much testing bc I'm at work and on phone, but if I had to take a guess you might just need to change your margins. About mes are much narrower than a forum post (at full size anyway) so you need to change the margins and possibly add in some code to retain the size of the images so they don't scale weirdly (if that's an issue)