<span class="btn-group" role="group">
  <input type="radio" class="btn-check" name="runPause" id="runButton" autocomplete="off" checked>
    <label class="btn btn-outline-success" for="runButton"><i class="fa-solid fa-play"></i>&nbsp;Run</label>

  <input type="radio" class="btn-check" name="runPause" id="pauseButton" autocomplete="off">
    <label class="btn btn-outline-danger" for="pauseButton"><i class="fa-solid fa-stop"></i>&nbsp;Stop</label>
</span>