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

<button class="w3-btn w3-margin w3-hover-grey">Button</button>

</body>
</html>


Result:
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