html { height: 100%; background: #0a0a0b; color-scheme: dark; }
body { margin: 0; min-height: 100%; min-height: 100dvh; display: grid; place-items: center; background: #0a0a0b; }
main { display: grid; place-items: center; }
.mark { display: block; width: min(44vmin, 280px); aspect-ratio: 1; }