<div class="text-center"> <button type="button" class="btn btn-primary btn-lg">Large button</button> <button type="button" class="btn btn-primary btn-sm">Small button</button> <button type="button" class="btn btn-secondary btn-lg">Large button</button> <button type="button" class="btn btn-secondary btn-sm">Small button</button> </div>
body{margin:30px;}