.@{stepsCls} {
  display: flex;
  >:first-child{
    .tail-front {
      display: none;
    }
  }
  >:last-child{
    .tail-back {
      display: none;
    }
  }
  .@{stepCls} {
    &.active {
      .tail-front,
      .tail-back {
        background-color: #F43838;
      }
    }
  }
}