.ipub-dropdown {
  position: relative;
  display: inline-block;
  .ipub-dropdown__title {
    cursor: pointer;
  }
  .ipub-dropdown__warp {
    position: absolute;
    width: max-content;
    max-height: 0;
    border-radius: 4px;
    transition: all 0.3s;
    overflow: hidden;
    box-sizing: border-box;
    z-index: 999;
    left: 0;
    margin-top: 14px;
    .ipub-dropdown__warp__item {
      background: #fff;
      border: 1px solid $border_color;
      padding: 10px 16px;
    }
  }
  &.active {
    .ipub-dropdown__warp {
      max-height: 500px;
    }
  }
}