vertical center button bootstrap 4 code example
Example 1: align eliment in center of row bootstrap
<div class="row justify-content-center">
...inner divs and content...
</div>
Example 2: bootstrap center align columns
<!-- Center columns in a Row -->
<div class="row d-flex justify-content-center text-center">
<div class="col-4">
</div>
<div class="col-4">
</div>
<div class="col-4">
</div>
</div>
Example 3: how to center vertically in bootstrap col
<div class="my-auto">
...inner divs and content...
</div>