body {
     background-color: #efefef;
     /* background-image:url(https://images.cnblogs.com/cnblogs_com/aloneme/2058319/o_211108072145_ship-g1c8d6f257_1920.jpg); */
     background-repeat: no-repeat;
     background-attachment: fixed;
     background-position: center 0;
     background-size: cover;
    padding-top:0px;
  }