#Download {
    width: 764px;
    height: 172px;
    text-align: center;
    position: absolute;
    top: 886px;
    left: 50%;
    margin-left: -390px;
    z-index: 51;
    border-radius: 5px;
    background: url(../images/down.png) no-repeat left top;
}

#Download .btn_down_s1 {
    float: left;
    width: 260px;
    height: 87px;
    text-indent: -999em;
    margin-left: 109px;
    margin-top: 43px;
}

#Download .btn_down_s2 {
    float: left;
    width: 181px;
    height: 87px;
    text-indent: -999em;
    margin-left: 0px;
    margin-top: 41px;
}

#Download .btn_down_s3 {
    float: left;
    width: 181px;
    height: 87px;
    text-indent: -999em;
    margin-left: 4px;
    margin-top: 42px;
}

#Download .btn_down_s4 {
    float: left;
    width: 105px;
    height: 104px;
    text-indent: -999em;
    overflow: hidden;
    margin-left: 16px;
    margin-top: 33px;
}
.topcontainer {
    width: 1920px;
    height: 1018px;
    left: 50%;
    margin-left: -960px;
    overflow: hidden;
    position: relative;
    background: url() no-repeat center;
    background-position: 0px 0px;
    margin-top: 68px;
}