Download the Developer's Toolbar for Firefox. Turn on "Outline Selected Element". Hover over the element, and it will give you the DOM selectors for it. Then style it in gallery.css.
You see the size height is off and the borders just arent right.
Also, I tried setting the borders on option to get the dropdown area with a white border around the outside only - however, it created a border around each select option. Anybody know of a workaround? I tried just bordering left and right and this gave the desired effect for all but the very bottom which remained default black(obviously)