     </div>
          <div class="calc-input">ID length:<input id="length" type="number" disabled>characters
            <input id="length-slider" type="range" min="2" max="36">
          </div>
          <div class="calc-input">Speed:<input id="speed" type="number">IDs per
            <span class="switch">
              <input id="unit-hour" name="unit" type="radio" value="hour">
              <label for="unit-hour" class="checked">hour</label><!--
              --><span>/</span><!--
              --><inpu