#home h1{
    font-size:45px;
}
body{
// background-image: url("https://www.cnblogs.com/images/cnblogs_com/lvonve/1497718/o_%e5%be%ae%e4%bf%a1%e5%9b%be%e7%89%87_20190706122237.jpg"); 
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://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E8%83%8C%E6%99%AF%E5%9B%BE%E7%89%87%E5%94%AF%E7%BE%8E&step_word=&hs=0&pn=41&spn=0&di=58630&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=2&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=-1&cs=2595486065%2C3078397786&os=3465305283%2C686744104&simid=0%2C0&adpicid=0&lpn=0&ln=977&fr=&fmq=1609900789776_R&fm=result&ic=0&s=undefined&hd=0&latest=0&copyright=0&se=&sme=&tab=0&width=&height=&face=undefined&ist=&jit=&cg=&bdtype=0&oriquery=&objurl=https%3A%2F%2Fgimg2.baidu.com%2Fimage_search%2Fsrc%3Dhttp%3A%2F%2Fpic.616pic.com%2Fys_b_img%2F00%2F10%2F21%2F5pvuf5jVRu.jpg%26refer%3Dhttp%3A%2F%2Fpic.616pic.com%26app%3D2002%26size%3Df9999%2C10000%26q%3Da80%26n%3D0%26g%3D0n%26fmt%3Djpeg%3Fsec%3D1612492804%26t%3D300547be939dc8e3165dd455d12bb218&fromurl=ippr_z2C%24qAzdH3FAzdH3Fm8mrtv_z%26e3Bv54AzdH3Ff7vwtAzdH3Fe5lt0400e_z%26e3Bip4s&gsm=2a&rpstart=0&rpnum=0&islist=&querylist=&force=undefined");
    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%;
    }
}