body{/*背景图片设置*/
     background-image: url("https://images.cnblogs.com/cnblogs_com/Pudon/1163322/o_15184222285a8148d47e092.png");
     background-repeat: repeat;
     background-attachment: fixed;
     background-size:cover;
 }

#home {
     opacity: 0.95
}