dialog::backdrop {
  background-color: rgba(0, 0, 0, 0.5);
  filter: blur(6px);
}

/* Animation */
dialog[open],
dialog[open]::backdrop {
  animation: fadein 0.2s ease-in-out;
}

@keyframes fadein {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}