:root{color:#1d1d1b;background:#f6f6f4;font-family:-apple-system,Segoe UI,Helvetica,Arial,sans-serif}body{margin:0}.centre{max-width:560px;margin:10vh auto;padding:0 20px;line-height:1.5}button{font:inherit;color:#fff;cursor:pointer;background:#2a6f4f;border:1px solid #2a6f4f;border-radius:4px;padding:6px 14px}input{font:inherit;letter-spacing:2px;width:8ch;padding:5px 8px}code{background:#eee;border-radius:3px;padding:2px 5px}[role=alert]{color:#a12a2a}