lsExist = true;
        const fillColor = otherControlsExist ? '#575E75' : '#ffffff';
        const updateFullScreen = () => {
          isFullScreen = !!(document.fullscreenElement || document.webkitFullscreenElement);
          document.body.classList.toggle('is-fullscreen', isFullScreen);
          if (isFullScreen) {
            fullscreenButton.src = 'data:image/svg+xml,' + encodeURIComponent('<svg width="20" height="20" xmlns="http://www.w3.org/2000/svg"><g fill="' + fillColor + '" fill-rule="evenodd"