alt</button>
    <button class="btn-alt btn-large">btn-alt</button>
    <button class="btn-alt btn-mega">btn-alt</button>
    <br />
    <br />
    <!-- btn-outline -->
    <h2>btn-outline</h2>
    <button class="btn-outline">btn-outline</button>
    <button class="btn-outline btn-small">btn-outline</button>
    <button class="btn-outline btn-medium">btn-outline</button>
    <button class="btn-outline btn-large">btn-outline</button>
    <button class="btn-outline btn-mega">btn-outline</button>
    <br />
  