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<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="../lib/w3.css">

<style>
h1{font-size:64px;}
h2{font-size:48px;}
h3{font-size:36px;}
h4{font-size:24px;}
h5{font-size:20px;}
h6{font-size:18px;}
</style>

<body class="w3-container">

<h1>Heading 1</h1>
<h2>Heading 2</h2>
<h3>Heading 3</h3>
<h4>Heading 4</h4>
<h5>Heading 5</h5>
<h6>Heading 6</h6>

</body>
</html>