body {
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  max-width: 720px;
  margin: 4rem auto;
  padding: 0 1rem 3rem;
  color: #111827;
  background: #ffffff;
}

a {
  color: inherit;
}

a:hover,
a:focus {
  color: #2563eb;
}

header,
main,
footer {
  display: block;
}

header {
  margin-bottom: 2rem;
}

footer {
  margin-top: 3rem;
  font-size: 0.875rem;
  color: #6b7280;
}

h1,
h2,
h3 {
  color: #111827;
}

p {
  margin: 1rem 0;
}