Your site looks to be down, so I can't inspect the styles to come up with a suggestion right now.
The following styles were the ones that were changed in the latest SCLogin. If you prefer, you can make your own theme to revert back instead of coming up with a style to work with our new default style definitions. However, as we progress SCLogin, you'll have to manually pull in changes to your own themes.
1. In /media/sourcecoast/css/common.css, we added "width: 94%;" to ".sourcecoast .modal-body" block.
2. In /media/sourcecoast/themes/sclogin/default.css, we added "height: auto !important;" to "#login-modal" block.
3. In /media/sourcecoast/css/common.css, we changed:
.sourcecoast .modal-body { overflow-y:visible; }
to
.sourcecoast .modal-body { overflow-y:auto;}
-Melissa