<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="4/w3.css">
<body>
<div class="w3-container">
<h2>Mobile First Responsiveness</h2>
<h3>Nested Rows (w3-half inside w3-half)</h3>
<p class="w3-large">Try to resize the window!</p>
</div>
<div class="w3-row">
<div class="w3-half w3-container w3-green">
<h2>w3-half</h2>
<div class="w3-row">
<div class="w3-half w3-container w3-red">
<h2>w3-half</h2>
<p>This is a paragraph.</p>
</div>
<div class="w3-half w3-container w3-yellow">
<h2>w3-half</h2>
<p>This is a paragraph.</p>
</div>
</div>
</div>
<div class="w3-half w3-container w3-blue">
<h2>w3-half</h2>
<div class="w3-row">
<div class="w3-half w3-container w3-red">
<h2>w3-half</h2>
<p>This is a paragraph.</p>
</div>
<div class="w3-half w3-container w3-yellow">
<h2>w3-half</h2>
<p>This is a paragraph.</p>
</div>
</div>
</div>
</div>
</body>
</html>