 step="0.1" value="0.5" max="1.0" min="0.0">
          </div>
          <div>
            <button class="feature-up" onclick="document.getElementById('era').stepUp();"></button>
            <button class="feature-down" onclick="document.getElementById('era').stepDown();"></button>
          </div>
        </div>
        <div class="feature">
          <div>
            <span>maturity:</span>
            <input id="maturity" type="number" step="0.1" value="0.5" max="1.0" min="0.0">
          </div>
         