:root{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background-color:#111;color:#f5f5f5}*{box-sizing:border-box}body{margin:0;min-height:100vh;display:flex;justify-content:center;align-items:center}#app{display:flex;flex-direction:column;align-items:center;gap:8px}.ui{display:flex;flex-direction:column;align-items:center;gap:4px}.buttons{display:flex;gap:8px;margin-bottom:4px}button{padding:6px 12px;border-radius:4px;border:none;cursor:pointer}button:hover{opacity:.9}canvas{border:2px solid #fff;background-color:#222}