nav{
	height:55px;
	width:100%;
	background:#232323;
}
nav a{
	font-family: "Segoe UI", "Hind Siliguri", "Microsoft JhengHei", "Arial";
	font-size: 1.25rem;
	display: block;
	width: 100%;
	height: 55px;
	padding:13px 0;
	box-sizing: border-box;
	text-align: center;
	color:#C7CFDD;
	position: relative;
}
nav a:hover,
nav .hdau_active a{
	color:white;
}
nav ul{
	width: 600px;
	height: 55px;
	margin-left: auto;5
}
nav li{
	display: inline-block;
	width: 100px;
	margin: 0 20px;
}
nav .hdau_active a:after{
	content:"";
	display: block;
	width: 100%;
	height: 2px;
	background: white;
	position: absolute;
	left: 0;
	bottom: 0;
	z-index: 1;
}

@media screen and (max-width: 620px) {
	nav ul{
		width: 100%;
	}
}
@media screen and (max-width: 480px) {
	nav,
	nav ul,
	nav a{
		height: 39px;
		width: 100%;
	}

	nav a{
		font-size: 1rem;
		padding:7px 0;
	}
}