code: function toggleFullScreen() {
      // Moz prefixed
      if (document.documentElement.mozRequestFullScreen) {
        if (!document.mozFullScreenElement) {
          document.documentElement.mozRequestFullScreen()
        } else {
          document.mozCancelFullScreen()
        }
      }
  
      // Moz not prefixed
      if (document.documentElement.requestFullscreen) {
        if (!document.fullscreenElement) {
          document.documentElement.requestFullscreen()
        } else {
          document.exitFullscreen()
        }
      }
    }
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