html,body{margin:0;padding:0;width:100%;height:100%;overflow:hidden}body{display:flex;justify-content:center;align-items:center;position:relative}video{width:100%;height:100%;object-fit:cover;filter:brightness(40%)}#video,#overlay{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;z-index:0}#overlay{z-index:1}#gui-container{position:absolute;top:10px;right:10px;z-index:999;pointer-events:auto}#gameCanvas{position:relative;z-index:2;width:100%;height:100%}