body{font:15px system-ui,sans-serif;margin:12px;background:#fff;color:#111}button{min-height:40px;padding:0 14px;border-radius:20px;border:1px solid #666;background:#fff}canvas{display:block;margin:8px 0;border:1px solid #ccc}pre{white-space:pre-wrap;font-size:12px}