<div class="input-group small-input-button"> <button class="btn btn-outline-secondary" type="button">Small</button> <input type="text"> </div> <div class="input-group"> <button class="btn btn-outline-secondary" type="button">default</button> <input type="text"> </div> <div class="input-group large-input-button"> <button class="btn btn-outline-secondary" type="button">Large</button> <input type="text"> </div>