Subscription widget CSS change

Hi, I'd like to change background color, text color in a widget area.

The address is

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