.modal {
  /* position: fixed; moves with scroll */
  position: fixed;
  font-size: 1.25rem;
  top: 20%;
  left: 5%;
  width: 90%;
  background-color: rgb(255, 255, 255);
  padding: 1rem;
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  display: none;
}

#backdrop {
    position: fixed;
    top:0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7) ;
    display: none;
}
@media (min-width: 48rem) {
  .modal {
    left: calc(50% - 20rem);
    width: 40rem;
  }
}