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<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.2/dist/js/bootstrap.bundle.min.js"></script> </head> <body> <div class="container mt-3"> <h2>Aspect Ratio</h2> <p>Create a responsive video and scale it nicely to the parent element.</p> <h2>Aspect ratio 1:1</h2> <div class="ratio ratio-1x1"> <iframe src="/i/photo/shanghai.mp4"></iframe> </div> <br> <h2>Aspect ratio 4:3</h2> <div class="ratio ratio-4x3"> <iframe src="/i/photo/shanghai.mp4"></iframe> </div> <br> <h2>Aspect ratio 16:9</h2> <div class="ratio ratio-16x9"> <iframe src="/i/photo/shanghai.mp4"></iframe> </div> <br> <h2>Aspect ratio 21:9</h2> <div class="ratio ratio-21x9"> <iframe src="/i/photo/shanghai.mp4"></iframe> </div> </div> </body> </html>