#hidden-objects-game{margin:0;padding:0;font-family:sans-serif;background-attachment:fixed;background-size:cover;overflow:hidden;}#game-canvas{margin:0 auto;display:block;}.url{margin-top:100px;}#sidebar{min-height:800px;height:100%;width:220px;top:0;right:0;padding:20px;position:absolute;background-color:#f1f1f1;box-shadow:-3px 0 5px rgba(0,0,0,0.1);}#sidebar h3{text-align:center;}.btn{width:100%;padding:10px 15px;margin:10px 0;text-align:center;background-color:#8a38c5;color:white;border-radius:5px;border:none;display:block;cursor:pointer;}.btn:hover{background-color:#b682f2;}#start-screen,#end-screen{top:50%;left:50%;padding:30px;text-align:center;background-color:rgba(255,255,255,0.9);box-shadow:0px 0px 10px rgba(0,0,0,0.5);border-radius:5px;display:none;position:absolute;transform:translate(-50%,-50%);}#timer{margin-top:20px;margin-bottom:10px;font-size:20px;text-align:center;}#level-indicator{margin-bottom:20px;font-size:18px;text-align:center;}