Alinhe o Elimento no centro da linha de bootstrap
<div class="row justify-content-center">
...inner divs and content...
</div>
Different Dragonfly
<div class="row justify-content-center">
...inner divs and content...
</div><!-- Center columns in a Row -->
<div class="row d-flex justify-content-center text-center">
<div class="col-4">
// Add Content
</div>
<div class="col-4">
// Add Content
</div>
<div class="col-4">
// Add Content
</div>
</div><div class="d-flex justify-content-start">...</div>
<div class="d-flex justify-content-end">...</div>
<div class="d-flex justify-content-center">...</div>
<div class="d-flex justify-content-between">...</div>
<div class="d-flex justify-content-around">...</div>