:root {
  color-scheme: light dark;
  --measure: 42rem;
}

body {
  margin: 0 auto;
  padding: 2rem 1rem;
  max-width: var(--measure);
  font-family: system-ui, sans-serif;
  line-height: 1.7;
}

header a {
  font-weight: 700;
  text-decoration: none;
}