:root { color-scheme: light dark; font-family: system-ui, sans-serif; }
body { margin: 0; }
main { max-width: 44rem; margin: 0 auto; padding: 2rem 1rem; }
textarea { box-sizing: border-box; min-height: 8rem; width: 100%; }
button { margin: .75rem .5rem 0 0; min-height: 2.75rem; }
#messages { padding-left: 1.5rem; }