/* 定制博客背景图片，url里面是你的图片位置信息 */
body { 
     background-color: #efefef;
     ![]()
     //background-image:url(https://img2020.cnblogs.com/blog/2533408/202111/2533408-20211117220422629-2058205511.jpg);
     background-image:url(https://img2020.cnblogs.com/blog/2533408/202110/2533408-20211030182552259-1536625101.png); 
     background-repeat: no-repeat; 
     background-attachment: fixed; 
     background-position: center 0; 
     background-size: cover; 
    padding-top:0px;
  }