 class="fas fa-microphone-alt"></i></div>
        </li>
        <li>
          <div title="cancel call!" id="cancelCallBtn" class="callBtn"><i class="fas fa-phone-slash"></i></div>
        </li>
        <li>
          <div title="add / remove camera!" id="addRemoveCameraBtn" class="callBtn"><i class="fas fa-video"></i></div>
        </li>
        <li id="screenBtnContainer">
          <div title="add / remove screen!" id="addRemoveScreenBtn" class="callBtn"><i class="fas fa-desktop"></i></div>
        </li>