.referrizer-popup-button {
  background-color: #d60000; /* your preferred color */
  color: white;
  padding: 12px 25px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-weight: 600;
  font-size: 16px;
  transition: background-color 0.3s ease;
}

.referrizer-popup-button:hover {
  background-color: #a00000; /* darker red on hover */
}