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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/4.0.0/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script> <style> .border { display: inline-block; width: 70px; height: 70px; margin: 6px; } </style> </head> <body> <div class="container"> <h2>Borders</h2> <p>Use the border classes to add or remove borders from an element:</p> <span class="border"></span> <span class="border border-0"></span> <span class="border border-top-0"></span> <span class="border border-right-0"></span> <span class="border border-bottom-0"></span> <span class="border border-left-0"></span> </div> </body> </html>