Building a sample page with the custom CSS grid
Here's the HTML we're going to use in this example:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Mastering RWD with HTML5 & CSS3</title>
<link rel="stylesheet" href="css/site-styles.css">
<!--[if lt IE 9]>
<script src="//html5shiv.googlecode.com/svn/trunk/html5.js">
</script>
<![endif]-->
</head>
<body>
<h1>Basic Layout Using a Custom CSS Grid</h1>
<main class="container-12 clear" role="main">
<header class="grid-12" role="banner">Header (.grid-12)</header>
<nav class="grid-4" role="navigation">Nav (.grid-4)</nav>
<section class="grid-8">
<div class="row">
<div class="grid...
