.countdown-panel {
  container-type: inline-size;
}
.countdown-panel:fullscreen .countdown-digits {
  font-size: min(clamp(2.5rem, 15vw, 15rem), 20cqi);
}
@media (max-width: 480px) {
  .countdown-digits {
    font-size: min(clamp(2.5rem, 15vw, 4rem), 20cqi);
  }
}