[bootstrap.css] col 내용 vertical-align middle 정렬하기

https://medium.com/wdstack/bootstrap-4-vertical-center-1211448a2eff

Bootstrap 4 Vertical Center

 

h-100 makes the row full height, and my-auto will vertically center the col-sm-12 column.

 

<div class="row h-100">
   <div class="col-sm-12 my-auto">
     <div class="card card-block w-25">Card</div>
   </div>
</div>