<div class="d-flex justify-content-center">
<div class="p-2">Flex item 1</div>
<div class="p-2">Flex item 2</div>
<div class="p-2">Flex item 3</div>
</div>
<!-- responsive variations -->
<div class="d-flex justify-content-sm-center">...</div>
<div class="d-flex justify-content-md-center">...</div>
<div class="d-flex justify-content-lg-center">...</div>
<div class="d-flex justify-content-xl-center">...</div>