[html] vertical-align with Bootstrap 3

I've spent a lot of time trying solutions from here and none of them helped me. After a few hours, I belive this will allow u to center vert any child element in BS3.

CSS

.vertical-center {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

HTML

<div class="col-md-6 vertical-center">
    <div class="container">
        <div class="row">
        </div> 
    </div>   
</div>

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