#home h1{
     font-size:45px;
 }
 body{
 background-image: url("放你的背景图链接"); background-position: initial; background-size: cover; background-repeat: no-repeat; background-attachment: fixed; background-origin: initial; background-clip: initial;
 height:100%;
 width:100%;
 }
 #home{
     opacity:0.7;
 }
 .wall{
     position: fixed;
     top: 0;
     left: 0;
     bottom: 0;
     right: 0;
 }
 div#midground{
     background: url("https://i.postimg.cc/PP5GtGtM/midground.png");
     z-index: -1;
     -webkit-animation: cc 200s linear infinite;
     -moz-animation: cc 200s linear infinite;
     -o-animation: cc 200s linear infinite;
     animation: cc 200s linear infinite;
 }
 div#foreground{
     background: url("https://i.postimg.cc/z3jZZD1B/foreground.png");
     z-index: -2;
     -webkit-animation: cc 253s linear infinite;
     -o-animation: cc 253s linear infinite;
     -moz-animation: cc 253s linear infinite;
     animation: cc 253s linear infinite;
 }
 div#top{
     background: url("https://i.postimg.cc/PP5GtGtM/midground.png");
     z-index: -4;
     -webkit-animation: da 200s linear infinite;
     -o-animation: da 200s linear infinite;
     animation: da 200s linear infinite;
 }
 @-webkit-keyframes cc {
     from{
         background-position: 0 0;
         transform: translateY(10px);
     }
     to{
         background-position: 600% 0;
     }
 }
 @-o-keyframes cc {
     from{
         background-position: 0 0;
         transform: translateY(10px);
     }
     to{
         background-position: 600% 0;
     }
 }
 @-moz-keyframes cc {
     from{
         background-position: 0 0;
         transform: translateY(10px);
     }
     to{
         background-position: 600% 0;
     }
 }
 @keyframes cc {
     0%{
         background-position: 0 0;
     }
     100%{
         background-position: 600% 0;
     }
 }
 
 @keyframes da {
     0%{
         background-position: 0 0;
     }
     100%{
         background-position: 0 600%;
     }
 }
 @-webkit-keyframes da {
     0%{
         background-position: 0 0;
     }
     100%{
         background-position: 0 600%;
     }
 }
 @-moz-keyframes da {
     0%{
         background-position: 0 0;
     }
     100%{
         background-position: 0 600%;
     }
 }
 @-ms-keyframes da {
     0%{
         background-position: 0 0;
     }
     100%{
         background-position: 0 600%;
     }
 }