  class="material-icons res"
              onclick="resetC()"
              title="Reset Contrast"
              >refresh</i
            >
          </div>
          <!--Opacity slider-->
          <div id="oslider" class="slider closed">
            <label for="o" title="Opacity"
              ><i class="material-icons ico">opacity</i></label
            >
            <input type="range" min="0" max="100" id="o" value="100" step="1" />
            <output for="range" id="oPointSize">100٪</output>
        