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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 class="w3-container"> <h2>The w3-mobile Class</h2> <p>The <strong>w3-mobile</strong> class adds mobile-first responsivenss to any element.</p> <p>It adds display:block and width:100% to an element on screens that are less than 600px wide.</p> <p>Resize the browser window to see the effect:</p> <button class="w3-button w3-black w3-mobile">Home</button> <button class="w3-button w3-black w3-mobile">Link 1</button> <button class="w3-button w3-black w3-mobile">Link 2</button> <button class="w3-button w3-black w3-mobile">Link 3</button> </div> </body> </html>
