使用CSS定位实现星级评价效果

<div class="star_evaluate">
       <span class="star star_10"></span>
</div>

.star_evaluate{
            position: relative;
            display: inline-block;
            width: 100px;
            height:16px;
            background: url("./../../public/img/star_gray.png") no-repeat;
            background-size:cover;
            overflow: hidden;
            .star{
              position: absolute;
              top:0;
              left:0;
              display: inline-block;
              height:16px;
              background: url("./../../public/img/star.png") no-repeat;
              background-size:cover;
              overflow: hidden;
            }
            .star_1{
              width:8px;
            }
            .star_2{
              width:21px;
            }
            .star_3{
              width:29px;
            }
            .star_4{
              width:42px;
            }
            .star_5{
              width:50px;
            }
            .star_6{
              width:63px;
            }
            .star_7{
              width:71px;
            }
            .star_8{
              width:84px;
            }
            .star_9{
              width:92px;
            }
            .star_10{
              width:100px;
            }
          }