:root { font: 16px/1.5 system-ui, sans-serif; color: #10263d; background: #f1f5f9; }
body { margin: 0 auto; padding: 1rem; max-width: 50rem; }
img { display: block; max-width: 100%; height: auto; margin: 1rem 0; }
main { background: white; border: 1px solid #52718b; padding: 1.5rem; border-radius: .5rem; }
a { color: #145784; } a:focus-visible { outline: 3px solid #bc5b00; outline-offset: 3px; }
footer { margin-top: 1.5rem; }