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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <style> * { box-sizing:border-box; } .left { background-color:#2196F3; padding:20px; float:left; width:20%; /* The width is 20%, by default */ } .main { background-color:#f1f1f1; padding:20px; float:left; width:60%; /* The width is 60%, by default */ } .right { background-color:#4CAF50; padding:20px; float:left; width:20%; /* The width is 20%, by default */ } /* Use a media query to add a break point at 800px: */ @media screen and (max-width:800px) { .left , .main, .right {width:100%;} } </style> </head> <body> <h2>Media Queries</h2> <p>Resize the browser window, up and down around 800px wide.</p> <div class="left"> <p>Left</p> </div> <div class="main"> <p>Main Content</p> </div> <div class="right"> <p>Right</p> </div> </body> </html>
