Twitter bootstrap scrollable modal

How about the below solution? It worked for me. Try this:

.modal .modal-body {
    max-height: 420px;
    overflow-y: auto;
}

Details:

1. remove overflow-y: auto; or overflow: auto; from .modal class (important)
2. remove max-height: 400px; from .modal class (important)
3. Add max-height: 400px; to .modal .modal-body (or what ever, can be 420px or less, but would not go more than 450px)
4. Add overflow-y: auto; to .modal .modal-body

Done, only body will scroll.