css 三角形

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<div class="business-div">                 <span>数据不一致</span>                 <div class="div-hover">                     <div class="label-dev">描述:<span>xxxxxxxxxxxxx</span>                     </div>                 </div>  </div>       .business-div{     position: absolute;      margin-top: -10px;      cursor: pointer;  }  .div-hover{      display: block;      background: #E6EBF2;      top: 27px;      left: -17px;      position: absolute;      width: 205px;      padding: 10px;      border: 1px solid #99AFCA;      border-radius: 5px;      z-index: 99;  }  .business-div:hover .div-hover{      display: block;      background: #E6EBF2;      top: 27px;      left: -17px;      position: absolute;      width: 205px;      padding: 10px;      border: 1px solid #99AFCA;      border-radius: 5px;      z-index: 99;  }  .div-hover:before{      content: "";      position: absolute;      top: -10px;      left: 40px;      border-bottom: 10px solid #99AFCA;      border-left: 10px solid transparent;      border-right: 10px solid transparent;  }  .div-hover:after{      content: "";      position: absolute;      top: -9px;      left: 40px;      border-bottom: 10px solid #E6EBF2;      border-left: 10px solid transparent;      border-right: 10px solid transparent;  }