:root { color-scheme: light; background: #f3f6f8; }
* { box-sizing: border-box; }
html, body, main { min-height: 100%; }
body { margin: 0; min-height: 100vh; background: #f3f6f8; }
main { display: grid; min-height: 100vh; place-items: center; padding: 2rem; }
img { display: block; width: min(28rem, 82vw); height: auto; }