@media only screen and (min-width: 768px) and (max-width: 999px) {
  h1 {
    font-size: 1.5em;
    line-height: 1.3;
  }
  h2 {
    font-size: 1.4em;
    line-height: 1.3;
  }
  h3 {
    font-size: 1.3em;
    line-height: 1.3;
  }
  h4 {
    font-size: 1.1em;
    line-height: 1.3;
  }
  h5 {
    font-size: 0.9em;
    line-height: 1.4;
  }
  h6 {
    font-size: 0.9em;
    line-height: 1.1;
  }
}