#home h1{
    font-size:45px;
}
body{
background-image:url('https://images.cnblogs.com/cnblogs_com/xiaozhang666/1795661/o_2006290847482969_1555147880.jpg');
background-size: cover; background-repeat: no-repeat; background-attachment: fixed; background-origin: initial; background-clip: initial;    background-position: -4px -1000px;
height:100%;
width:100%;
}
#home{
    opacity:1;
}
.wall{
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
}

div#top{
    background: url("https://images.cnblogs.com/cnblogs_com/JobsOfferings/1363202/o_ed86aac6.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%;
    }
}


pre {
    margin-top: 0;
    margin-bottom: 0;
   background-color: rgba(245, 245, 245, 1);
    padding: 0px;
    border-radius: 11px;
    overflow-x: scroll;
}