.auth-captcha {
  display: flex;
  justify-content: center;
  width: 100%;
  min-width: 0;
  margin: 12px 0;
}

/* Compact CAPTCHA is taller; keep the complete signup form reachable. */
#modalOverlay .modal {
  max-height: calc(100vh - 40px);
  max-height: calc(100dvh - 40px);
  overflow-y: auto;
  overscroll-behavior: contain;
}