html,body{color:#b6ff00;background:#000;height:100%;margin:0;font:12px ui-monospace,monospace;overflow:hidden}canvas{width:100%;height:100%;display:block}.fps{background:#000;border:1px solid #b6ff00;padding:2px 6px;position:fixed;top:6px;right:8px}.msg{background:#000;border:1px solid #b6ff00;padding:16px;line-height:1.5;position:fixed;inset:30% 10% auto}.msg.fail{color:#ff6b5f;border-color:#ff3b30;font-size:14px}