styling upload button in css

Hi Guys!
I want to change the color of the browse button. Right now it is grey by default.

I tried to change it with Firebug – background colour: #A3B139
as a result I receive green not only the button, but an area “File is not found” as well. But I need only button to be green. Any suggestions?

http://www.ft-studio.com/translator-application-3/?w3tc_note=flush_all