@media only screen and (min-width: 320px) {
  .back_coll_text h2 {
    color: #fff;
    font-weight: 900;
    font-size: 3.8rem;
    text-transform: capitalize;
    margin: 3vh 0;
  }
}
@media only screen and (min-width: 768px) {
  .back_coll_text h2 {
    color: #fff;
    font-weight: 900;
    font-size: 6rem;
    text-transform: capitalize;
    margin: 3vh 0;
  }
}