Email form with captcha - 2 minor issues

[AngelEyes]

I installed this php with captcha email form on my website --> http://reusableforms.com/d/d4/php-email-form-with-captcha

I have it working. :) But there are two things that I want to change.

(1) I want to change the color of the submit button. I have semi done that with the following code:

.btn {
  background: rgba(77, 56, 36, .75);
  border: 1px solid #271c16;
  color: #c3db74; }

.btn:hover, 
.btn:active,
.btn:visited {
  background-color: rgba(196, 227, 64, .65);  
  border: 3px solid #c7d8e8;
  box-shadow: 1px 1px 21px #271c16;
  color: #271c16; }

What is not working is when the form returns with an incorrect captcha entry then the button color reverts back to orange. How do I fix this?

(2) Once a radio button is selected it is not allowing me to deselect them. How can this be fixed?