body { font: 17px/1.45 -apple-system, system-ui, sans-serif; margin: 0; }
main { max-width: 34rem; margin: 0 auto; padding: 1.5rem 1.25rem; }
h1 { font-size: 1.4rem; margin: 0 0 0.5rem; }
button { font: inherit; font-weight: 600; padding: 0.75rem 1.25rem; margin: 0.5rem 0.5rem 0 0; border-radius: 0.6rem; border: 0; background: #0a66d8; color: #fff; }
button:disabled { opacity: 0.5; }
pre { font: 15px/1.5 ui-monospace, Menlo, monospace; white-space: pre-wrap; margin-top: 1.25rem; }