[Plugin: Custom Contact Forms] changing top margin for a label

There is too much space below the label and not enough above it so that the label looks like it belongs to the input field above it not below it.
I changed the setting for label margin but it only adds space below. So I set it back to 0.
How do I change the style for this?

You can see what I mean at

http://wordpress.org/extend/plugins/custom-contact-forms/