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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 Button Groups Height Sizing</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; } </style> </head> <body> <div class="bs-example"> <div class="btn-group mb-2 btn-group-lg"> <button type="button" class="btn btn-primary">Home</button> <button type="button" class="btn btn-primary">About</button> <button type="button" class="btn btn-primary">Services</button> </div> <br> <div class="btn-group mb-2"> <button type="button" class="btn btn-primary">Home</button> <button type="button" class="btn btn-primary">About</button> <button type="button" class="btn btn-primary">Services</button> </div> <br> <div class="btn-group btn-group-sm"> <button type="button" class="btn btn-primary">Home</button> <button type="button" class="btn btn-primary">About</button> <button type="button" class="btn btn-primary">Services</button> </div> </div> </body> </html>