.@{menu-prefix-cls}.@{menu-prefix-cls}-vertical {
  .@{menu-item-prefix-cls}::after {
    transition: @transition-base;
    position: absolute;
    right: -1px;
    top: 50%;
    content: '';
    display: inline-block;
    height: 0;
    width: 0;
  }

  .@{menu-item-prefix-cls}-active {
    background: @primary-color-choosed;

    &::after {
      top: 0;
      height: 100%;
      width: 3px;
      background: @primary-color;
    }
  }
}