[Plugin: WooCommerce] Change color of Variations select button

I’d greatly appreciate help with how to change the select box from blue to green. I poured over code, tried FireBug and searched online yet nothing. ?? It can’t be that difficult to do, albeit what should be a simple task has stumped me completely.

Example Page

The variation select boxes are blue as you see on the example page. How does one change that to green or #xxxxxx? Thanks in advance!

WC 2.1.2