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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/5/w3.css"> <body> <div class="w3-container"> <h2>Section 1</h2> <p>You will not change this section.</p> </div> <div id="demo" class="w3-container"> <h2>Dark Mode Section</h2> <p>Click the button to change this section.</p> <p> <button class="w3-button w3-black" onclick="darkMode()">Toggle Dark Mode</button> </p> </div> <div class="w3-container"> <h2>Section ¨2</h2> <p>You will not change this section.</p> </div> <script> function darkMode() { document.getElementById("demo").classList.toggle("w3-black"); } </script> </body> </html>
