#home h2{
    font-size: 200%;
    font-weight: normal;
    color: #1b82f1;
    background-color: #ededed;
    text-shadow: 0 0 1px black;
}

#topics .postTitle {
    border: 0;
    font-size: 230%;
    font-weight: bold;
    float: left;
    line-height: 1.5;
    width: 100%;
    padding-left: 5px;
}

#home h1{
    font-size:45px;
}
body{
background-image: url("https://images.cnblogs.com/cnblogs_com/ymzm204/1754294/o_200429093231TIM%E5%9B%BE%E7%89%8720200429172951.png"); 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:0.8;
}
.wall{
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
}
div#midground{
    background: url(" https://images.cnblogs.com/cnblogs_com/JobsOfferings/1363202/o_ed86aac6.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://images.cnblogs.com/cnblogs_com/JobsOfferings/1363202/o_ed86aac6.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://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%;
    }
}