body {
    color: #000;
    background: #fff;
    font-family: 'PingFang SC','Helvetica Neue','Helvetica','Arial','Microsoft Yahei',sans-serif;
    font-size: 12px;
    min-height: 101%;
    background-size: 100% auto;
    background-attachment: fixed;
    background: url(//images.cnblogs.com/cnblogs_com/wzhao-cn/1533412/o_68dd5a535c6a48ec0a1c7390d00420a8.jpg)fixed;
}
#home {
    margin: 0 auto;
    width: 65%;
    opacity: 0.7;
}