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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> <div class="w3-container w3-section w3-blue"> <h1>I am Heading 1</h1> <p>I am a paragraph.</p> </div> <div class="w3-container w3-section w3-green"> <h1>I am Heading 1</h1> <p>I am a paragraph.</p> </div> </body> </html>