body { margin: 0; font-family: system-ui, sans-serif; background: #111; color: #eee; }
main { max-width: 28rem; margin: 15vh auto; padding: 0 1.5rem; }
.muted { color: #999; }
.error { color: #f77; }
.button, button { display: inline-block; padding: .6rem 1.1rem; border: 1px solid #555; border-radius: .4rem;
  background: #222; color: #eee; text-decoration: none; font: inherit; cursor: pointer; }
.button:hover, button:hover { background: #333; }
.danger { border-color: #844; color: #f99; }