<div class="custom-control custom-radio">
  <input type="radio" class="custom-control-input" name="example1" id="option1">
  <label for="option1" class="custom-control-label">option1</label>
</div>
<div class="custom-control custom-radio">
  <input type="radio" class="custom-control-input" name="example1" id="option2">
  <label for="option2" class="custom-control-label">option2</label>
</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.