CSS:
.pro{ width:960px; height:auto; margin:10px;}
.pro1{ width:311px; height:auto; margin:0 0 9px 9px; text-align:center; background:url(../images/pro-bg.jpg) no-repeat;}
.icon{width:139px; height:139px; margin:20px 80px; float:left}
.buy1{ width:137px; height:35px; margin:10px 60px; float:left;}
因为pro1高度自动的原因吧，你设置一个高度试下
