html { color-scheme: light dark; font-family: system-ui, -apple-system, sans-serif; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; }
main { max-width: 42rem; padding: 3rem; }
h1 { margin: 0 0 1rem; font-size: 2rem; }
p { opacity: .75; }