.popup-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.55);
  
  display: flex;
  align-items: center;
  justify-content: center;

  opacity: 0;
  visibility: hidden;
  transition: opacity .35s ease, visibility .35s;
  z-index: 9999;
}

.popup-overlay.active {
  opacity: 1;
  visibility: visible;
}

.popup {
  transform: scale(.9);
  opacity: 0;

  transition: transform .35s ease, opacity .35s ease;
}

.popup-overlay.active .popup {
  transform: scale(1);
  opacity: 1;
}

.popup .modal-header, .popup .modal-footer {
  border: none;
  font-size: 1.2rem;
  line-height: 1.5rem;
}

.popup i {
  font-size: 1.2rem;
}