html,
body {
    height: 100%;
    margin: 0;
    font-family: arial, "Microsoft YaHei";
    color: #FEFEFE;
}

body {
    background-size: 100% 100%;
    background-position: center center;
    background-repeat: no-repeat;
    background-image: url("../images/bg.jpg");
    -webkit-transition: all .3s ease-out;
    -moz-transition: all .3s ease-out;
    -ms-transition: all .3s ease-out;
    -o-transition: all .3s ease-out;
    transition: all .3s ease-out;
}

#fileWrapper {
    transition: all 0.5s ease;
}

#fileWrapper:hover {
    opacity: 1 !important;
}

#visualizer_wrapper {
    text-align: center;
}

footer {
    position: fixed;
    bottom: 2px;
    color: #aaa;
}

.play-box {
    position: fixed;
    width: 1000px;
    height: 100px;
    margin: 0 auto;
    left: 0;
    right: 0;
    bottom: 0;
}