.cupo-popup-success .cupo-popup-body > header {
  background-color: green;
}
.cupo-popup-success .cupo-popup-body > .cupo-popup-buttons > button {
  background-color: green;
}

.cupo-popup-error .cupo-popup-body > header {
  background-color: red;
}
.cupo-popup-error .cupo-popup-body > .cupo-popup-buttons > button {
  background-color: red;
}