Question: How did you know a "well" css class exists in Twitter Bootstrap. I cannot find it in the documentation, but it's in your code and it's in the Bootstrap file!
I found it in one of their demo applications. They hide a lot of stuff in there.
Got a link to their demo apps? I just have the 3 html examples linked in from the main doc sheet.
I also found that the Twitter Bootstrap documentation isn't complete. Using Chrome's Web Inspector to look at interesting elements of the Twitter Bootstrap website is a nice addition to its documentation.