:root { color-scheme: light dark; }
body {
  font-family: system-ui, sans-serif;
  line-height: 1.6;
  margin: 0;
  display: grid;
  place-items: center;
  min-height: 100vh;
}
main {
  padding: 2rem;
  max-width: 40rem;
  text-align: center;
}
h1 { font-size: 1.5rem; margin: 0 0 .5rem; }
p { margin: .25rem 0; }