.zan-popup {
  position: fixed;
  background-color: #fff;
  width: 100%;
  height: 100%;
  top: 50%;
  left: 50%;
  transform: translate3d(-50%, -50%, 0);
  transition: .2s ease-out;
}

.zan-popup--top {
  width: 100%;
  top: 0;
  right: auto;
  bottom: auto;
  left: 50%;
  transform: translate3d(-50%, 0, 0);
}

.zan-popup--right {
  transform: translate3d(50%, -50%, 0);
}

.zan-popup--left {
  transform: translate3d(-150%, -50%, 0);
}

.zan-popup--show {
  transform: translate3d(-50%, -50%, 0);
}