 <button class="btn btn-small"><i class="icon-circle"></i></button>
        </div>
        <div>
          <button class="btn">Button</button>
          <button class="btn"><i class="icon-circle"></i> Button</button>
          <button class="btn"><i class="icon-circle"></i></button>
        </div>
        <div>
          <button class="btn btn-large">Button</button>
          <button class="btn btn-large"><i class="icon-circle"></i> Button</button>
          <button class="btn btn-large"><i class="icon-circ