body{
	margin: 0;
	padding: 0;
	font-family: sans-serif;
}

header{
	background: #00795f;
	width: 100%;
	padding: 15px 0;
	color: #fff;
	text-align: center;
}

nav ul{
	background-color: #001d60;
	overflow: hidden;
	color: #fff;
	padding: 0;
	text-align: center;
	margin: 0;
	transition: max-height 0.5s;
}

nav ul li{
	display: inline-block;
	padding: 20px;
}

nav ul li a{
	text-decoration: none;
	color: inherit;
}

nav ul li:hover{
	background-color:#888;
}

.menu-icon{
	width: 100%;
	background: #001d60;
	text-align: left;
	box-sizing: border-box;
	padding: 15px 10px;
	cursor: pointer;
	color: #fff;
	display: none;
	text-align: right;
}

@media (max-width: 580px){
	nav ul{
		max-height: 0px;
		
	}

	.showing{
		max-height: 20em;
	}

	nav ul li{
		box-sizing: border-box;
		width: 100%;
		padding: 15px;
		text-align: left;
	}

	.menu-icon{
		display: block;
	}
}