ant-design/style/components/cascader.less

.ant-cascader {
  font-size: @font-size-base;
  &-input {
    width: 172px;
    display: block;
  }
  &-menus {
    font-size: 12px;
    overflow: hidden;
    background: #fff;
    position: absolute;
    border: 1px solid @border-color-base;
    border-radius: @border-radius-base;
    box-shadow: @box-shadow-base;
    &-hidden {
      display: none;
    }
    &.slide-up-enter.slide-up-enter-active&-placement-bottomLeft,
    &.slide-up-appear.slide-up-appear-active&-placement-bottomLeft {
      animation-name: antSlideUpIn;
    }

    &.slide-up-enter.slide-up-enter-active&-placement-topLeft,
    &.slide-up-appear.slide-up-appear-active&-placement-topLeft {
      animation-name: antSlideDownIn;
    }

    &.slide-up-leave.slide-up-leave-active&-placement-bottomLeft {
      animation-name: antSlideUpOut;
    }

    &.slide-up-leave.slide-up-leave-active&-placement-topLeft {
      animation-name: antSlideDownOut;
    }
  }
  &-menu {
    float: left;
    width: 111px;
    height: 180px;
    list-style: none;
    margin: 0;
    padding: 0;
    border-right: 1px solid @border-color-split;
    &:last-child {
      border-right-color: transparent;
      margin-right: -1px;
    }
  }
  &-menu-item {
    height: 32px;
    line-height: 32px;
    padding: 0 16px;
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: all 0.3s ease;
    &:hover {
      background: tint(@primary-color, 90%);
    }
    &-active {
      background: tint(@primary-color, 80%);
      &:hover {
        background: tint(@primary-color, 80%);
      }
    }
    &-expand {
      position: relative;
      &:after {
        content: '\e600';
        font-family: 'anticon';
        .iconfont-size-under-12px(8px);
        color: #999;
        position: absolute;
        right: 15px;
        line-height: 32px;
      }
    }
  }
}