<div class="row justify-content-md-center">
      <div class="col-6 d-flex justify-content-md-center">
             Column
            </div>
            <div class="col-6 d-flex justify-content-md-center">
              Column
            </div>
           </div>

External CSS

  1. https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.min.css

External JavaScript

This Pen doesn't use any external JavaScript resources.