:root { font-family: Arial, sans-serif; color: #15202b; background: #f4f6f7; }
main { max-width: 36rem; margin: 12vh auto; background: white; padding: 2rem; border-radius: .75rem; box-shadow: 0 3px 16px #0002; }
button { background: #0f6b46; color: white; border: 0; border-radius: .4rem; padding: .8rem 1.1rem; font-size: 1rem; cursor: pointer; }
pre { white-space: pre-wrap; background: #f4f6f7; padding: 1rem; border-radius: .4rem; }