A Lil' Help?

I don't know what "detonate this" button I hit, but I somehow managed to make my sidebar's background end at the end of sidebar content. Can someone give me a hand in returning it to when I had it going all the way down the page, all purty-like?

Speaking of sidebars, all the "decent" new articles from Mid-March until now have been added to the list of what I think is my best work. Have a lookie, if you're new. It's right there. -->