CSS伪类实现0.5px边框

• div-class为需要添加0.5px边框的元素的类名，下面是less写法，css写法把嵌套的&::after提出来，换成.div-class::after

.div-class {
  position: relative;
  &::after{
    position: absolute;
    bottom: 0;
    content:'';
    width: 100%;
    height: 1px;
    background-color: #F1F1F1;
    transform: scaleY(0.5);
  }
}