#download{width:1920px;height:400px;position:absolute;top:10px;left:50%;margin-left:-960px;z-index:1500;}

/*下载*/
#downloada{float:left;width:1920px;height:400px;overflow:hidden;margin-right:20px;margin-top:10px}

#downloada .btn_downa{float:left;width:268px;height:254px;;position:relative;text-indent:-9999em;background:url("1.png"/*tpa=https://www.70boss.com/style1/1.png*/)/*tpa=http://3w7.tingxi888.com/wz/253%E5%86%8D%E6%88%98%E6%B2%89%E9%BB%98/style1/1.png*/ no-repeat left bottom;display:block;margin-left:20px;}

#downloada .btn_downb{float:left;width:400px;height:400px;position:relative;text-indent:-9999em;background:url("2.gif"/*tpa=https://www.70boss.com/style1/2.gif*/)/*tpa=http://3w7.tingxi888.com/wz/253%E5%86%8D%E6%88%98%E6%B2%89%E9%BB%98/style1/2.gif*/ no-repeat left bottom;display:block;margin-left:1120px;}

#downloada .btn_downc{float:left;width:340px;height:121px;position:relative;text-indent:-9999em;background:url("btn-3.png"/*tpa=https://www.70boss.com/style1/btn-3.png*/)/*tpa=http://3w7.tingxi888.com/wz/253%E5%86%8D%E6%88%98%E6%B2%89%E9%BB%98/style1/btn-3.png*/ no-repeat left bottom;display:block;margin-left:60px;}
#downloada .btn_downc:hover{text-decoration:none;background:url("btn-3_hover.png"/*tpa=https://www.70boss.com/style1/btn-3_hover.png*/)/*tpa=http://3w7.tingxi888.com/wz/253%E5%86%8D%E6%88%98%E6%B2%89%E9%BB%98/style1/btn-3_hover.png*/ no-repeat left top;}