body { font-family: system-ui, sans-serif; margin: 0; background: #000; color: #fff; }
nav { background: #222; padding: 1rem; }
nav a { color: #fff; margin-right: 1rem; text-decoration: none; }
nav a.logout { float: right; margin-right: 0; }
main { max-width: 40rem; margin: 2rem auto; padding: 0 1rem; }
input, button { padding: .5rem; font-size: 1rem; }