[css] Bootstrap 4 Center Vertical and Horizontal Alignment

None has worked for me. But his one did.

Since the Bootstrap 4 .row class is now display:flex you can simply use the new align-self-center flexbox utility on any column to vertically center it:

<div class="row">
   <div class="col-6 align-self-center">
      <div class="card card-block">
      Center
      </div>
   </div>
   <div class="col-6">
      <div class="card card-inverse card-danger">
      Taller
      </div>
   </div>
</div>

I learned about it from https://medium.com/wdstack/bootstrap-4-vertical-center-1211448a2eff

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