body { 
     background-color: #efefef;
     background-image:url(https://img2024.cnblogs.com/blog/3487271/202412/3487271-20241208212650308-1512651698.png); 
     background-repeat: no-repeat; 
     background-attachment: fixed; 
     background-position: center 0; 
     background-size: cover; 
    padding-top:0px;
  }