twitter/bootstrap — pull request #431 by southpolesteve (2011-10-16 21:04:14+00:00)
Title: Forms inside modals should have margin-bottom 0px

Implementing bootstrap into a rails app today, and ran into this issue. When a form is placed inside a modal, the margin-bottom: 18px; causes there to be a white bar at the bottom of the modal if the submit button is inside '.modal-footer'. The attached code should fix this specific case.