html,body{touch-action:none;-webkit-user-select:none;user-select:none;overscroll-behavior:none;width:100%;height:100%;margin:0;padding:0;overflow:hidden}#canvas{width:100%;height:100%;position:fixed;top:0;left:0}h1{color:#fff;font-size:20px}h2{color:#fff;font-size:18px}#ui-overlay{z-index:10;flex-direction:column;gap:2px;display:flex;position:absolute;top:20px;left:20px}#controls{position:absolute;bottom:20px;left:20px}.disp-btn{cursor:pointer;background-color:#f5f5f5;padding:5px}.disp-btn.active{background-color:#a9a9a9}