Automatic Simple XML Dashboard: How to add a scroll bar to the fieldset elements

Hi Everyone, I have a use case where, a dashboard should contain 15 selections with a combination of checkbox, dropdown, radi button, text boxes etc etc... When I use all of them, the dashboard looks odd as all these selections itself take three rows, instead, I would like to use a scroll bar instead. Can some one help me with the easiest solution to achieve this?? Regards, BK