quipu/index.html

## index.html
<!doctype html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>CSS Only Navigation Menu</title>
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<link rel="stylesheet" href="style.css">
</head>
<body>
	<label for="show-menu" class="show-menu">Show Menu</label>
	<input type="checkbox" id="show-menu" role="button">
		<ul id="menu">
		<li><a href="#">Home</a></li>
		<li>
			<a href="#">About ￬</a>
			<ul class="hidden">
				<li><a href="#">Who We Are</a></li>
				<li><a href="#">What We Do</a></li>
			</ul>
		</li>
		<li>
			<a href="#">Portfolio ￬</a>
			<ul class="hidden">
				<li><a href="#">Photography</a></li>
				<li><a href="#">Web & User Interface Design</a></li>
				<li><a href="#">Illustration</a></li>
			</ul>
		</li>
		<li><a href="#">News</a></li>
		<li><a href="#">Contact</a></li>
	</ul>
</body>
</html>

## styles.css
/*Strip the ul of padding and list styling*/
ul {
	list-style-type:none;
	margin:0;
	padding:0;
	position: absolute;
}

/*Create a horizontal list with spacing*/
li {
	display:inline-block;
	float: left;
	margin-right: 1px;
}

/*Style for menu links*/
li a {
	display:block;
	min-width:140px;
	height: 50px;
	text-align: center;
	line-height: 50px;
	font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
	color: #fff;
	background: #2f3036;
	text-decoration: none;
}

/*Hover state for top level links*/
li:hover a {
	background: #19c589;
}

/*Style for dropdown links*/
li:hover ul a {
	background: #f3f3f3;
	color: #2f3036;
	height: 40px;
	line-height: 40px;
}

/*Hover state for dropdown links*/
li:hover ul a:hover {
	background: #19c589;
	color: #fff;
}

/*Hide dropdown links until they are needed*/
li ul {
	display: none;
}

/*Make dropdown links vertical*/
li ul li {
	display: block;
	float: none;
}

/*Prevent text wrapping*/
li ul li a {
	width: auto;
	min-width: 100px;
	padding: 0 20px;
}

/*Display the dropdown on hover*/
ul li a:hover + .hidden, .hidden:hover {
	display: block;
}

/*Style 'show menu' label button and hide it by default*/
.show-menu {
	font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
	text-decoration: none;
	color: #fff;
	background: #19c589;
	text-align: center;
	padding: 10px 0;
	display: none;
}

/*Hide checkbox*/
input[type=checkbox]{
    display: none;
}

/*Show menu when invisible checkbox is checked*/
input[type=checkbox]:checked ~ #menu{
    display: block;
}


/*Responsive Styles*/

@media screen and (max-width : 760px){
	/*Make dropdown links appear inline*/
	ul {
		position: static;
		display: none;
	}
	/*Create vertical spacing*/
	li {
		margin-bottom: 1px;
	}
	/*Make all menu links full width*/
	ul li, li a {
		width: 100%;
	}
	/*Display 'show menu' link*/
	.show-menu {
		display:block;
	}
}
	<!doctype html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<title>CSS Only Navigation Menu</title>
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<link rel="stylesheet" href="style.css">
	</head>
	<body>
	<label for="show-menu" class="show-menu">Show Menu</label>
	<input type="checkbox" id="show-menu" role="button">
	<ul id="menu">
	<li><a href="#">Home</a></li>
	<li>
	<a href="#">About ￬</a>
	<ul class="hidden">
	<li><a href="#">Who We Are</a></li>
	<li><a href="#">What We Do</a></li>
	</ul>
	</li>
	<li>
	<a href="#">Portfolio ￬</a>
	<ul class="hidden">
	<li><a href="#">Photography</a></li>
	<li><a href="#">Web & User Interface Design</a></li>
	<li><a href="#">Illustration</a></li>
	</ul>
	</li>
	<li><a href="#">News</a></li>
	<li><a href="#">Contact</a></li>
	</ul>
	</body>
	</html>
	/Strip the ul of padding and list styling/
	ul {
	list-style-type:none;
	margin:0;
	padding:0;
	position: absolute;
	}

	/Create a horizontal list with spacing/
	li {
	display:inline-block;
	float: left;
	margin-right: 1px;
	}

	/Style for menu links/
	li a {
	display:block;
	min-width:140px;
	height: 50px;
	text-align: center;
	line-height: 50px;
	font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
	color: #fff;
	background: #2f3036;
	text-decoration: none;
	}

	/Hover state for top level links/
	li:hover a {
	background: #19c589;
	}

	/Style for dropdown links/
	li:hover ul a {
	background: #f3f3f3;
	color: #2f3036;
	height: 40px;
	line-height: 40px;
	}

	/Hover state for dropdown links/
	li:hover ul a:hover {
	background: #19c589;
	color: #fff;
	}

	/Hide dropdown links until they are needed/
	li ul {
	display: none;
	}

	/Make dropdown links vertical/
	li ul li {
	display: block;
	float: none;
	}

	/Prevent text wrapping/
	li ul li a {
	width: auto;
	min-width: 100px;
	padding: 0 20px;
	}

	/Display the dropdown on hover/
	ul li a:hover + .hidden, .hidden:hover {
	display: block;
	}

	/Style 'show menu' label button and hide it by default/
	.show-menu {
	font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
	text-decoration: none;
	color: #fff;
	background: #19c589;
	text-align: center;
	padding: 10px 0;
	display: none;
	}

	/Hide checkbox/
	input[type=checkbox]{
	display: none;
	}

	/Show menu when invisible checkbox is checked/
	input[type=checkbox]:checked ~ #menu{
	display: block;
	}


	/Responsive Styles/

	@media screen and (max-width : 760px){
	/Make dropdown links appear inline/
	ul {
	position: static;
	display: none;
	}
	/Create vertical spacing/
	li {
	margin-bottom: 1px;
	}
	/Make all menu links full width/
	ul li, li a {
	width: 100%;
	}
	/Display 'show menu' link/
	.show-menu {
	display:block;
	}
	}