html { font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif; } h1 { font-size: large; } .container { display: flex; gap: 20px; border: 0; margin: 0; padding: 0; } .column { flex: 1; } @media (max-width: 600px) { .container { flex-direction: column; } }