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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> .container { position: relative; width: 100%; overflow: hidden; padding-top: 100%; /* 1:1 Aspect Ratio */ } .responsive-iframe { position: absolute; top: 0; left: 0; bottom: 0; right: 0; width: 100%; height: 100%; border: none; } </style> </head> <body> <h2>Responsive Iframe</h2> <h3>Maintain Aspect Ratio 1:1</h3> <p>Resize the window to see the effect.</p> <div class="container"> <iframe class="responsive-iframe" src="https://www.youtube.com/embed/tgbNymZ7vqY"></iframe> </div> </body> </html>
