/* If the screen size is 601px wide or more, set the font-size of <div> to 80px */
@media screen and (min-width: 601px) {
    .customherofontsize {
      font-size:8vw !important;
    }
  }
  
  /* If the screen size is 600px wide or less, set the font-size of <div> to 30px */
  @media screen and (max-width: 600px) {
    .customherofontsize {
      font-size:17vw !important;
    }
  }