:root {
  color-scheme: light dark;
  font-family: system-ui, sans-serif;
}
main {
  max-width: 42rem;
  margin: 3rem auto;
  padding: 0 1.25rem;
  line-height: 1.65;
}
h1, h2 { line-height: 1.25; }
h2 { margin-top: 2rem; }