#Snow{
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        z-index: 99999;
        background: rgba(255,255,240,0.1);
        pointer-events: none;
 }
body { 
     background-color: #efefef;
     background-image: url(https://images.cnblogs.com/cnblogs_com/blogs/661364/galleries/1930648/t_210209132024QQ%E5%9B%BE%E7%89%8720210209212000.jpg);
     background-repeat: no-repeat; 
     background-attachment: fixed; 
     background-position: center 0; 
     background-size: cover; 
  }