body {
    background-repeat: no-repeat;  
    background: rgba(12, 100, 129, 0)  fixed;
    background-image:url('https://images.cnblogs.com/cnblogs_com/zhexuejun/1986619/o_21061106012024afd70eb3fcc940c6890ba5d3a12243.jpeg');
    background-size: 100%;
    background-repeat: no-repeat;
    font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
    font-size: 12px;
    min-height: 101%;
}