body{color:#222;background:#f6f6f6;margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Noto Sans,Ubuntu,Cantarell,Helvetica Neue,sans-serif}main{background:#fff;border-radius:.5rem;max-width:40rem;margin:4rem auto;padding:2rem}button{margin-right:.5rem;padding:.4rem 1rem}.greeting{color:#0a7}