/* ---- DESKTOP (≥769 px) ---- */
@media (min-width: 769px) {
  .sz-heading-h1 {          /* replace with the class you saw */
    font-size: 48px !important;
    line-height: 1.1 !important;
  }
  .sz-heading-h2 {
    font-size: 36px !important;
  }
}

/* ---- MOBILE (≤768 px) ---- */
@media (max-width: 768px) {
  .sz-heading-h1 {
    font-size: 32px !important;
    line-height: 1.15 !important;
  }
  .sz-heading-h2 {
    font-size: 24px !important;
  }
}