* { margin: 0; padding: 0; box-sizing: border-box; } #app { width: 100%; height: 100vh; overflow: hidden; background-color: #fafafa; } .header { width: 100%; height: 3.4rem; background: url("https://lsxd-customcard-h5.oss-cn-hangzhou.aliyuncs.com/department-of-finance/img/detail-bg.png") no-repeat; background-size: 100%; margin-top: -0.88rem; }