body{font:17px system-ui,sans-serif;background:#102024;color:#f4f7f6;margin:0;padding:24px}main{max-width:720px;margin:auto}button{font:inherit;padding:14px;margin:6px;border-radius:8px}pre{white-space:pre-wrap;background:#061519;padding:16px;border-radius:8px}button:disabled{opacity:.5}