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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> <title>Bootstrap 4 Border Color Classes</title> <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.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/1.14.7/umd/popper.min.js"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script> <style> .bs-example{ margin: 20px; } .bs-example span{ display: inline-block; width: 100px; height: 100px; margin: 10px; background-color: #f5f5f5; } </style> </head> <body> <div class="bs-example"> <span class="border border-primary"></span> <span class="border border-secondary"></span> <span class="border border-success"></span> <span class="border border-danger"></span> <span class="border border-warning"></span> <span class="border border-info"></span> <span class="border border-dark"></span> <span class="border border-light"></span> <span class="border border-white"></span> </div> </body> </html>