.backdrop {
  display: none;
  position: fixed;
  left: 0;
  top: 0;
  width: 100vw;
  height: 100vh;
  z-index: 40;
  background: rgba(18, 18, 18, 0.51);
}
.backdrop--open {
  display: block;
}
.backdrop--open-enter-active {
  animation: fade-in 0.35s;
}
.backdrop--open-leave-active {
  animation: fade-out 0.3s;
}