body{margin:0 auto;max-width:720px;padding:0 16px;font:16px/1.5 sans-serif;color:#222;background:#fff}
header{display:flex;align-items:center;gap:16px;padding:12px 0;border-bottom:1px solid #ccc}
header a{color:#222}
pre{background:#f4f4f4;padding:8px;overflow-x:auto}