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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/w3.css"> <body> <div class="w3-container"> <h2>Blue Color</h2> <div class="w3-container w3-blue"> <p>Blue container</p> </div> <p class="w3-blue">Blue paragraph</p> <button class="w3-btn w3-blue">Blue Button</button> </div> </body> </html>
