Subscription widget CSS change

Hi, I'd like to change background color, text color in a widget area.
The address is http://englishjump.net/contact-2/.

How can I change in the following way?

1. No border lines except "E-Mail Address" area
2. background color : White
3. text color : #2f2f2f
4. "Go" area background color : #9c0621

Please refer to the picture attached.

Thank you in advance

Jeonghun