.fade {
  transition: opacity 0.6s linear;
  opacity: 0;
}
.fade.in {
  opacity: 0.86;
}
.acgTop {
  position: fixed;
  right: -3px;
  bottom: 0;
  z-index: 128;
  display: none;
  width: 172px;
  height: 258px;
  background: url("img/reimu.png");
  cursor: pointer;
}
@media screen and (min-width: 768px) {
  .acgTop.active {
    display: block;
  }
  .acgTop:hover {
    opacity: 1;
  }
}