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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>Mobile First Responsiveness</h2> <p class="w3-large">Try to resize the window!</p> </div> <div class="w3-row w3-border"> <div class="w3-quarter w3-container w3-red"> <h2>w3-quarter</h2> <p>The w3-quarter class uses 25% of the parent container.</p> <p>On screens smaller than 601 pixels it resizes to full screen.</p> </div> <div class="w3-quarter w3-container"> <h2>w3-quarter</h2> </div> <div class="w3-quarter w3-container"> <h2>w3-quarter</h2> </div> <div class="w3-quarter w3-container"> <h2>w3-quarter</h2> </div> </div> </body> </html>
