:root { color-scheme: light dark; }
body.variant-b {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font: 16px/1.5 system-ui, sans-serif;
  background: #5b2a86;
  color: #fff;
}
main { max-width: 40rem; padding: 2rem; text-align: center; }
h1 { font-size: clamp(2.5rem, 10vw, 6rem); letter-spacing: .1em; margin: 0 0 1rem; }
.hint { opacity: .8; font-size: .9rem; }
code { background: rgba(255,255,255,.15); padding: .1em .35em; border-radius: 4px; }