@charset'utf-8';
*{margin:0px;padding:0px;}
html{background-color: #fff;}
img{display: block; border:none;max-width:100%;}
a:link,a:visited,a:hover,a:active{text-decoration: none;}
body{
    margin: 0 auto;
    max-width: 750px;
    background:  url('../img/download_bg.png') no-repeat top;
    background-size: 100% auto;
}
.download{
    padding-top: 92%;
}
.download-btn{
    margin: 0 auto 8%;
    width: 42%;
}
.copyright{
    text-align: center;
    padding: 30px 10px 50px 10px;
    width: 100%;
}
.copyright img{
    display: inline-block;
    max-width: 100px;
}
@media screen and (min-height:700px){ /*超过700的高度，就放到下面吧，以免底部太多留白*/
    .copyright{
        position: fixed;
        bottom: 0;
    }
}