#Download {
    width: 665px;
    height: 121px;
    text-align: center;
    position: absolute;
    left: 50%;
    margin-left: -338px;
    z-index: 51;
    border-radius: 5px;
    background: url(../image/xz.png) no-repeat left top;
}

#Download .btn_down_s1 {
    float: left;
    width: 162px;
    height: 50px;
    text-indent: -999em;
    margin-left: 145px;
    margin-top: 10px;
}

#Download .btn_down_s2 {
    float: left;
    width: 162px;
    height: 47px;
    text-indent: -999em;
    margin-left: -162px;
    margin-top: 60px;
}

#Download .btn_down_s3 {
    float: left;
    width: 99px;
    height: 100px;
    text-indent: -999em;
    margin-left: 18px;
    margin-top: 8px;
}

#Download .btn_down_s4 {
    position: absolute;
    right: 0;
    top: 0;
    float: left;
    width: 109px;
    height: 110px;
    text-indent: -999em;
    overflow: hidden;
    margin-right: 0px;
    margin-top: 0px;
}

.topcontainer {
    width: 1920px;
    height: 1004px;
    left: 50%;
    margin-left: -960px;
    overflow: hidden;
    position: relative;
    background: url() no-repeat center;
    background-position: 0px 0px;
    margin-top: 68px;
}