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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="../lib/w3.css">
<body>

<button onclick="document.getElementById('id01').style.display='block'" class="w3-btn">Open Modal</button>

<div id="id01" class="w3-modal">
  <div class="w3-modal-content w3-card-4">
    <header class="w3-container w3-teal"> 
      <span onclick="document.getElementById('id01').style.display='none'" class="w3-closebtn">&times;</span>
      <h2>Header</h2>
    </header>
    <div class="w3-container">
      <p>Some text. Some text. Some text.</p>
      <p>Some text. Some text. Some text.</p>
    </div>
    <footer class="w3-container w3-teal">
      <p>Footer</p>
    </footer>
  </div>
</div>
            
</body>
</html>