body {
    color: #000;
    background: #fff;
    font-family: 'PingFang SC','Helvetica Neue','Helvetica','Arial','Microsoft Yahei',sans-serif;
    font-size: 12px;
    min-height: 100%;
    background: url(https://www.cnblogs.com/images/cnblogs_com/tubybassoon/1281127/o_123.png) top center #cbdcec;
    background-size: 100% auto;
    background-attachment: fixed;
}