body{
      font-size:15px;
       padding:0;
       margin:0;
     font-family:"微软雅黑","宋体",Arial;
    background-image: url("https://images.cnblogs.com/cnblogs_com/sch01ar/1918630/o_2102060529292038307.jpg");
    background-position: initial;
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-origin: initial;
    background-clip: initial;
    height:100%;
    width:100%;
min-width:1200px;
    }