上传图片组件的悬停显示删除等操作遮罩层

>div:last-child{
      position:absolute;
      height:50px;
      width:50px;
      top:0;
      left:0;
      opacity:0;
      background:rgba(0,0,0,0.5);
      border-radius:10%;
      transition:.3s all;
      display:flex;
      align-items:center;
      justify-content: center;
      color:white;
      >i{
        display:none;
      }
    }