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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.rocschool.com/public/static/w3css/4/w3.css"> <body> <div class="w3-container w3-blue"> The w3-container class has a default 16px left and right padding, and no top or bottom padding. </div> </body> </html>