:root { color-scheme: light; }
* { box-sizing: border-box; }
html, body { margin: 0; background: #fff; }
main {
    min-height: 100vh;
    min-height: 100svh;
    display: grid;
    place-items: center;
    padding: 32px;
}
img {
    display: block;
    width: min(100%, 480px);
    height: auto;
}