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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 rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js"></script> </head> <body> <div class="container"> <h1>Responsive Containers</h1> <p>Resize the browser window to see the effect.</p> </div> <div class="container-sm border">.container-sm</div> <div class="container-md mt-3 border">.container-md</div> <div class="container-lg mt-3 border">.container-lg</div> <div class="container-xl mt-3 border">.container-xl</div> </body> </html>
