body {
  max-width: 42rem;
  margin: 0 auto;
  padding: 2rem 1.25rem;
  font: 1.05rem/1.6 system-ui, -apple-system, "Segoe UI", sans-serif;
  color: #1f2328;
  background: #fff;
}
h1 { font-size: 1.9rem; line-height: 1.25; }
h2 { font-size: 1.25rem; margin-top: 2rem; }
a { color: #0b57d0; }
footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid #d0d7de;
  font-size: 0.95rem;
}