#modal {
  bottom: 0;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
  transition: background 0.1s;
  z-index: 999999;
}
#modal > * {
  background: white;
  border: 1px solid #d6d6d6;
  border-radius: 3px;
  left: calc(50% - 180px);
  position: absolute;
  top: calc(50% - 75px);
  width: 360px;
}
#modal:empty {
  pointer-events: none;
}
#modal:not(:empty) {
  background: rgba(0, 0, 0, 0.3);
}