@media (max-width: 576px) {
  header.masthead .masthead-content .masthead-heading {
    font-size: 2.5rem;
  }
}

header.masthead .masthead-content .masthead-subheading {
  font-size: 2rem;
}

@media (min-width: 577px) {
  header.masthead .masthead-content .masthead-heading {
    font-size: 4rem;
  }
}

@media (min-width: 768px) {
  header.masthead .masthead-content .masthead-subheading {
    font-size: 3rem;
  }
}