I'm experimenting with the Twenty Twelve theme and it appears that at some point during my futzing, I somehow lost the white space buffer/border between the text portion and the background.
You'll note that my texts, menus, and images bleed off the middle section into the background.
Check out the demo for comparison: http://twentytwelvedemo.wordpress.com/category/daytrips/
I have not altered the css in any way myself. I have been through every option in the left-hand menu multiple times and can find nothing which would "restore" the original setting somehow.
The blog I need help with is l0ngst0rysh0rt.wordpress.com.