.cupom {
  -webkit-appearance: none;
}

.label {
  border: 6px solid #18f98d;
  color: #18f98d;
  transition: 0.5s;
}

.cupom:checked + .label {
  background-color: #18f98d;
  color: white;
  box-shadow: 0 15px 45px rgba(24, 249, 141, 0.2);
}