https://www.cnblogs.com/zqzjs/archive/2017/02/10/6380318.html


.price-monitoring-list-left img {
  display: block;
  position: relative;
  text-align: center;
}
.price-monitoring-list-left img:after {
  content: url(src/assets/img/default.png);
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #fff;
}
 
                         
                                

