Inténtalo tú mismo - W3.CSS icons

<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="/lib/w3.css">
<link rel="stylesheet" href="../../fonts.googleapis.com/icon-family=Material+Icons.html">
<style>
.material-icons{vertical-align:-14%}
</style>
<body class="w3-container">

<h1>Google Icons</h1>

<p>
<button class="w3-btn w3-teal w3-xlarge">Button<i class="w3-margin-left material-icons">cloud</i></button>
</p>

<p>
<i class="material-icons w3-spin w3-jumbo">cloud</i>
</p>

<div class="w3-padding w3-xlarge w3-teal">
<i class="material-icons w3-xlarge">home</i>
<i class="material-icons w3-xlarge">search</i>
<i class="material-icons w3-xlarge">cloud</i>
<i class="material-icons w3-xlarge">delete</i>
Welcome!
</div>

</body>
</html>