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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>Mobile First Responsiveness</h2> <h3>Nested Rows (w3-half inside w3-half)</h3> <p class="w3-large">Try to resize the window!</p> </div> <div class="w3-row"> <div class="w3-half w3-container w3-green"> <h2>w3-half</h2> <div class="w3-row"> <div class="w3-half w3-container w3-red"> <h2>w3-half</h2> <p>This is a paragraph.</p> </div> <div class="w3-half w3-container w3-yellow"> <h2>w3-half</h2> <p>This is a paragraph.</p> </div> </div> </div> <div class="w3-half w3-container w3-blue"> <h2>w3-half</h2> <div class="w3-row"> <div class="w3-half w3-container w3-red"> <h2>w3-half</h2> <p>This is a paragraph.</p> </div> <div class="w3-half w3-container w3-yellow"> <h2>w3-half</h2> <p>This is a paragraph.</p> </div> </div> </div> </div> </body> </html>