<div class="btn-group">
  <input class="btn-check" type="radio" name="robotChoice" value="dolores" id="dolores_ck">
  <label class="btn btn-outline-info" for="dolores_ck">
    Dolores
  </label>

  <input class="btn-check" type="radio" name="robotChoice" value="bubbles" id="bubbles_ck" checked>
  <label class="btn btn-outline-info" for="bubbles_ck">
    Bubbles
  </label>

  <input class="btn-check" type="radio" name="robotChoice" value="cosmo" id="cosmo_ck">
  <label class="btn btn-outline-info" for="cosmo_ck">
    Cosmo
  </label>
</div>