body,html{overflow:hidden;width:100%;height:100%}*{padding:0;margin:0;box-sizing:border-box}#app{overflow:hidden}#app,#screen-saver,#web-viewer{width:100%;height:100%}#screen-saver{position:fixed;z-index:1;left:0;top:0}#screen-saver video{pointer-events:none}