jzhw_uni/lib/vant-weapp/common/style/hairline.css

.van-hairline,
.van-hairline--bottom,
.van-hairline--left,
.van-hairline--right,
.van-hairline--surround,
.van-hairline--top,
.van-hairline--top-bottom {
    position: relative;
}
.van-hairline--bottom:after,
.van-hairline--left:after,
.van-hairline--right:after,
.van-hairline--surround:after,
.van-hairline--top-bottom:after,
.van-hairline--top:after,
.van-hairline:after {
    position: absolute;
    box-sizing: border-box;
    -webkit-transform-origin: center;
    transform-origin: center;
    content: ' ';
    pointer-events: none;
    top: -50%;
    right: -50%;
    bottom: -50%;
    left: -50%;
    border: 0 solid #eee;
    -webkit-transform: scale(0.5);
    transform: scale(0.5);
}
.van-hairline--top:after {
    border-top-width: 1px;
}
.van-hairline--left:after {
    border-left-width: 1px;
}
.van-hairline--right:after {
    border-right-width: 1px;
}
.van-hairline--bottom:after {
    border-bottom-width: 1px;
}
.van-hairline--top-bottom:after {
    border-width: 1px 0;
}
.van-hairline--surround:after {
    border-width: 1px;
}