collapsable divs not positioning correctly - overlap other content

Several divs in various areas of the theme overlap with the div below it in ie7. I believe this has something to do with ie7 handling float correctly while other browsers do not. Setting a min-height: 0 within the style has fixed this issue under other circumstances, but I'm not sure where to look in this theme. I've attached one example from a checkout page. Any help resolving this would be much appreciated. Please don't take this as a complaint, I love the theme and you have done great work!