index.less

.am-popup {
  &-content {
    position: fixed;
  }

  &-mask {
    visibility: hidden;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(0, 0, 0, 0.75);
    opacity: 0;
  }

  &-left {
    transform: translateX(-100%);
    left: 0;
    top: 0;
    bottom: 0;
  }

  &-right {
    transform: translateX(100%);
    right: 0;
    top: 0;
    bottom: 0;
  }

  &-top {
    top: 0;
    width: 100vw;
    transform: translateY(-100%);
  }

  &-bottom {
    bottom: 0;
    width: 100vw;
    transform: translateY(100%);
  }

  &-show &-content {
    transform: none;
  }

  &-show &-mask {
    visibility: visible;
    opacity: 1;
  }

  &.animation &-content {
    transition: all 200ms linear;
  }

  &.animation &-mask {
    transition: all 200ms linear;
  }
}