#curtain-overlay {
  position: fixed;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: black;
  z-index: 9999;
  /*transition: top 0.2s ease-in-out;*/
}

#curtain-overlay.show {
  top: 0;
}

#curtain-overlay.after-show {
  top: 100%;
}

#curtain-overlay.animated {
  transition: top 0.2s ease-in-out;
}

#index-bilibili {
  text-decoration: none;
}