body {
        color:#000;
        background: #fff;
        font-family: 'PingFang SC','Helvetica Neue','Helvetica','Arial','Microsoft Yahei',sans-serif;
        font-size: 12px;
        min-height: 105%;
        background: url(https://img2018.cnblogs.com/blog/1567872/201903/1567872-20190320105513506-2090632646.jpg) top center #cbdcec;
        background-size: 100%auto;
        background-attachment: fixed
    }