/* topnav small */
header li {
  font-size: 1.2rem;
  line-height: 1.4rem;
}
/* topnav medium */
@media screen and (min-width: 40em) {
  header li {
    font-size: 1.3rem;
    line-height: 1.5rem;
  }
}
/* topnav large */
@media screen and (min-width: 64em) {
  header li {
    font-size: 1.3rem;
    line-height: 1.5rem;
  }
}