html,body{margin:0;height:100%;overflow:hidden;background:#111;color:#eee;font:13px/1.4 system-ui,sans-serif}canvas{display:block;width:100%;height:100%}.panel{position:absolute;top:12px;left:12px;padding:8px 12px;border-radius:6px;background:rgba(0,0,0,.55);display:flex;flex-direction:column;gap:6px}.panel label{display:flex;gap:6px;align-items:center}