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<!DOCTYPE html>
<html>
<head>
<title>Google Icons</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
</head>
<body>

<h1>undo</h1>

<i class="material-icons">undo</i>
<i class="material-icons" style="font-size:36px">undo</i>
<i class="material-icons" style="font-size:48px;color:red">undo</i>

<p>Used on a button:</p>
<button style="font-size:24px">Button <i class="material-icons">undo</i></button>

</body>
</html>