body {
  font:
    16px/1.6 system-ui,
    sans-serif;
  max-width: 42rem;
  margin: 0 auto;
  padding: 2rem 1rem;
  color: #1a1a1a;
  background: #fff;
}
h1 {
  margin-top: 0;
}
h2 {
  margin-top: 2rem;
}
a {
  color: #0b5fff;
}
footer {
  margin-top: 3rem;
  font-size: 0.9rem;
  color: #555;
}
@media (prefers-color-scheme: dark) {
  body {
    color: #e8e8e8;
    background: #111;
  }
  a {
    color: #7aa7ff;
  }
  footer {
    color: #999;
  }
}