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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">×</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>