html,body{width:100%;height:100%;margin:0;padding:0;overflow:hidden}#canvas{width:100%;height:100%;position:fixed;top:0;left:0}h1{font-size:20px}#ui-overlay{z-index:10;flex-direction:column;gap:2px;display:flex;position:absolute;top:20px;left:20px}#ui-overlay button{cursor:pointer;background-color:#f5f5f5;padding:5px}#mesh-overlay{z-index:10;opacity:0;background-color:#fff;flex-direction:column;gap:10px;display:flex;position:absolute;top:20px;right:20px}#ui-overlay h1{color:#fff}#mesh-overlay h1{color:#000}