phpBB3 postprofile border

Hi! New user here

I am currently trying out things to customize my forum. One of the things that kinda annoy me is that the border on the right side of .postprofile doesn't go all the way to the bottom of the post. It doesn't go lower than the .postprofile div itself. Since I'm not a CSS genius and have not worked much with div's (the only thing I did in my HTML years ages ago was tables), I have no idea how to make this happen. Since the parent div doesn't have any height specific styles, I can't simply put height: 100% either.

Any suggestions?

Please provide your forum URL for appearance problems.

The forum I have is set to members only, but you can clearly see the same thing with the borders on this forum.

https://help.forumotion.com/t103239-presenting-the-results-of-question-as-a-table

The top post has a white border in between postprofile and postbody, and as you can see it does not extend to the bottom of the post. A workaround would be to put the border on the left side of postbody, but then the border would not descend the full length of postprofile if the post is short.