#downloada{    height: 96px;
    overflow: hidden;
    margin-top: -190px;
    width: 1280px;
    position: absolute;
    left: 50%;
    z-index: 100;
    margin-left: -530px;}
#downloada .btn_downa{float:left;width:345px;height:96px;position:relative;text-indent:-9999em;background:url("../images/btn01.png")/*tpa=https://www.77boss.com/images/btn01.png*/ no-repeat left bottom;display:block;margin-top:0px}
#downloada .btn_downa:hover{text-decoration:none;background:url("../images/btn01_hover.png")/*tpa=https://www.77boss.com/images/btn01_hover.png*/ no-repeat left top}
#downloada .btn_downb{float:left;width:345px;height:96px;position:relative;text-indent:-9999em;background:url("../images/btn02.png")/*tpa=https://www.77boss.com/images/btn02.png*/ no-repeat left bottom;display:block;margin-left:50px}
#downloada .btn_downb:hover{text-decoration:none;background:url("../images/btn02_hover.png")/*tpa=https://www.77boss.com/images/btn02_hover.png*/ no-repeat left top}
#downloada .btn_downc{float:left;width:345px;height:96px;position:relative;text-indent:-9999em;background:url("../images/btn03.png")/*tpa=https://www.77boss.com/images/btn03.png*/ no-repeat left bottom;display:block;margin-left:50px;margin-top:0px}
#downloada .btn_downc:hover{text-decoration:none;background:url("../images/btn03_hover.png")/*tpa=https://www.77boss.com/images/btn03_hover.png*/ no-repeat left top}