#app-portal {
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  position: absolute;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 1200;
}

#app-portal:empty {
  display: none;
}