JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>
<button class="btn btn-primary">Button without outline</button>
<hr />
<div class="btn-group btn-group-toggle d-flex" data-toggle="buttons">
              <label class="btn btn-primary w-100 active">
                <input type="radio" name="options" id="option1" autocomplete="off"> Button with outline
              </label>
              <label class="btn btn-primary w-100">
                <input type="radio" name="options" id="option2" autocomplete="off"> Button with outline
              </label>
            </div>

CSS

body {
  margin: 1rem;
}
[class*="btn-"]:focus {
  -webkit-box-shadow: none;
          box-shadow: none
}