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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 Margin-bottom 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; border: 1px solid #ccc; } .bs-example div{ padding: 15px; font-size: 18px; background: #dbdfe5; } .bs-example div:nth-child(2n){ background: #abb1b8; } </style> </head> <body> <div class="bs-example"> <div class="mb-0">.mb-0</div> <div class="mb-1">.mb-1</div> <div class="mb-2">.mb-2</div> <div class="mb-3">.mb-3</div> <div class="mb-4">.mb-4</div> <div class="mb-5">.mb-5</div> <div class="mb-auto">.mb-auto</div> </div> </body> </html>