vant-weapp/dist/cell-group/index.wxss

.cell-group{position:relative;background-color:#fff;overflow:hidden}.cell-group--with-border::after{content:'';position:absolute;top:0;left:0;width:200%;height:200%;-webkit-transform:scale(.5);transform:scale(.5);-webkit-transform-origin:0 0;transform-origin:0 0;pointer-events:none;box-sizing:border-box;border:0 solid #e5e5e5;border-top-width:1px;border-bottom-width:1px}