<div class="btn-toolbar">
  <a href="" class="btn btn-primary">1</a>
  <a href="" class="btn btn-primary">2</a>
  <a href="" class="btn btn-primary">3</a>
  <a href="" class="btn btn-primary">4</a>
  <a href="" class="btn btn-primary">5</a>
  <a href="" class="btn btn-primary">6</a>
   </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.