::backdrop {
  background-color: rgba(0,0,0,.3)
}
dialog{
  border: 2px solid #abc;
  border-radius: 12px;
  filter: drop-shadow(0 0 20px #999);
  position: absolute;
  top: 80px;
  width: 600px;
  padding: 0;
}
dialog.sm{
  width: 300px;
}
dialog.md{
  width: 600px;
}
dialog.lg{
  width: 1200px;
}
dialog.xl{
  width: 96%;
}