nav ul li{border-right:1px solid #dfdfdf}
nav ul li:last-child{border-right:0}
nav ul li ul{display:inline;visibility:hidden;position:absolute;padding:0;max-height:none;overflow:visible}
nav ul li:target > ul{max-height:none}
nav ul li:hover > ul{visibility:visible}
nav ul:after{clear:both;content:" ";display:block;font-size:0;height:0;visibility:hidden}