<!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-white w3-border w3-margin w3-hover-black">Button</button>
</body>
</html>