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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/3.4.1/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script></head><body><div class="container"> <h2>Example</h2> <p>Resize this page to see how the text below changes:</p> <h1 class="hidden-xs bg-danger">This text is hidden on an EXTRA SMALL screen.</h1> <h1 class="hidden-sm bg-info">This text is hidden on a SMALL screen.</h1> <h1 class="hidden-md bg-warning">This is text hidden on a MEDIUM screen.</h1> <h1 class="hidden-lg bg-success">This is text hidden on a LARGE screen.</h1></div> </body></html>