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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="https://www.w3schools.com/w3css/4/w3pro.css">
<style>
.w3-amber{color:#000!important;background-color:#ffc107!important}
</style>
<body>
<div class="w3-container w3-amber">
  <h1>W3.CSS Pro</h1>
  <p>With W3.CSS you can define your own colors.</p>
</div>
</body>
</html>