:root{color-scheme:light dark;font-family:system-ui,sans-serif}body{margin:0;min-height:100vh;display:grid;place-items:center;background:Canvas;color:CanvasText}.cartao{max-width:28rem;padding:2rem;border:1px solid color-mix(in srgb,CanvasText 20%,transparent);border-radius:.75rem}h1{margin-top:0;font-size:1.4rem}