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<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/4.5.2/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/1.16.0/umd/popper.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script></head><body><div class="container"> <h2>Responsive Centered Aligned Text</h2> <p>Resize the browser window to see the effect.</p> <p class="text-center">Center-aligned text on all screen sizes.</p> <p class="text-sm-center">Center-aligned text on small or wider screens.</p> <p class="text-md-center">Center-aligned text on medium or wider screens.</p> <p class="text-lg-center">Center-aligned text on large or wider screens.</p> <p class="text-xl-center">Center-aligned text on xlarge or wider screens.</p></div></body></html>