mCaptcha/templates/email/css/button.css

.button:hover {
  background-color: #993299;
  cursor: pointer;
  transform: translateY(-5px);
}

.button {
  background-color: #800080;
  color: rgba(255, 255, 255, 0.87);
  border-radius: 5px;
  border: 1px rgba(0, 0, 0, 0.125) solid;
  padding: 10px;
  font-size: 20px;
  min-height: 45px;
}