.bt4{height:320px;background:url(../images/mac_bg.png) no-repeat;}
.bt4 ul{padding:20px 0;}
.bt4 ul li{float:left;padding:0;width:386px;height:32px;list-style:none;position:relative;}
.bt4 ul li a{display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;position:absolute;height:32px;line-height:32px;left:34px;bottom:0;width:270px;color:#333}
.bt4 ul li a:hover{color:#0099e5;}
.bt4 ul li span{display:block;width:40px;height:30px;line-height:30px;color:#777;position:absolute;right:24px;bottom:0px;}