bootstrap 4 vertical center classess 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: bootstrap 5 vertical align
<span class="align-baseline">baseline</span><span class="align-top">top</span><span class="align-middle">middle</span><span class="align-bottom">bottom</span><span class="align-text-top">text-top</span><span class="align-text-bottom">text-bottom</span>