Help! My left border is overlapping

I added a link to my blog: https://www.wump.info/wumpblog in the normal way and then when I came back to my blog to “view site” the left border suddenly was overlapping the actual blog entries (at least at the top). I tried removing the link I had added and this had no effect on this problem whatsoever. I really have no idea what is causing this all of a sudden, as I was not having this problem previously and hadn’t made any changes that could predictably cause a problem. Any help would be appreciated. Thanks!