for the life of me I can't figure out how to remove the header. I have this:
h3.leftBoxHeading, h3.rightBoxHeading {display: none;} in my css and all other sideboxes have the header removed except for the editable sidebox.
I'm sure its simple, what am I missing?

the site is http://www.upliftingarts.com/newstore/ and its the newsletter sign up box on the left.