@media only screen and (max-width: 600px) {
  body {
    font-size: 16px;
  }
  h1 {
    font-size: 3.5rem; /* 2 * 16px = 32px */
}
  }
  h2 {
    font-size: 3.5rem; /* 2 * 16px = 32px */
}