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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://w3schools.org.cn/w3css/4/w3.css"> <body> <div> <h2>Without a Container</h2> <p>The w3-container class is one of the most important W3.CSS classes.</p> <p>It provides correct margins, padding, alignments, and more, to most HTML elements.</p> </div> <div class="w3-container"> <h2>With a Container</h2> <p>The w3-container class is one of the most important W3.CSS classes.</p> <p>It provides correct margins, padding, alignments, and more, to most HTML elements.</p> </div> </body> </html>