Hover broken

I have the button re-styled after the HUGE changes made to the HTML (shouldn’t have to rework the CSS after an UPDATE)

The popup works the same as before the big changes BUT when I hover over the button, the color change doesn’t happen and I get a javascript:void error.

The CSS code:

/*** Contribute by Mail button ***/
a.paoc-popup-click.paoc-popup-cust-1270.paoc-popup-button.paoc-popup-btn {
  width: 250px;
  height: 51px;
  padding: 7px 20px;
  margin-top: 29px;
  text-align: center;
  border-radius: 0px;
  border: 3px solid #4684A9;
  color: #fff;
  font-weight: 300;
  background-color: #003F6C;
  letter-spacing: 1px;
  font-size: 21px;
  display: inline-block;
  text-decoration: none;
  border-radius: 25px;
}

a.paoc-popup-click.paoc-popup-cust-1270.paoc-popup-button.paoc-popup-btn:hover {
  background-color: #4684A9;
}
/*** Contribute by Mail button END ***/

The page I need help with: [log in to see the link]