.amount-btn.active {
  background-color: #007bff;
  color: white;
  border-color: #007bff;
}

.amount-btn {
  transition: all 0.3s ease;
}

.amount-btn:hover {
  background-color: #0056b3;
  color: white;
  border-color: #0056b3;
}

#customAmount {
  max-width: 200px;
}