div>
        <div class="btn p-3 neu-concave neu-large rounded-3">Concave</div>
        <div class="btn p-3 neu-pressed neu-large rounded-3">Pressed</div>
        <div class="btn p-3 neu-flat neu-large rounded-3">Flat</div>
        <div class="p-3 neu-concave neu-large rounded-full">
          <div class="p-4 neu-flat rounded-full"><i class="txt-blue fas fa-play"></i></div>
        </div>
        <div class="btn p-3 neu-bordered neu-large rounded-3">bordered</div>
      </div>

      <!-- Dark background --