body {
    color: #000;
    background: url(https://images.cnblogs.com/cnblogs_com/dnoir/1404961/o_1550979414949.jpg) fixed;
    background-size: 100%;
    background-repeat: no-repeat;
    font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
    font-size: 12px;
    min-height: 101%

}