bootstrap vertically center text code example
Example 1: bootstrap vertical align
<div class="d-flex align-items-start">...</div>
<div class="d-flex align-items-end">...</div>
<div class="d-flex align-items-center">...</div>
<div class="d-flex align-items-baseline">...</div>
<div class="d-flex align-items-stretch">...</div>
Example 2: how to center vertically in bootstrap col
<div class="my-auto">
...inner divs and content...
</div>