.nav-link {
  letter-spacing: 0px;
  transition: letter-spacing 0.3s ease;
}
.nav-link:hover {
  letter-spacing: 3px;
}
@media (max-width: 768px) {
  .nav-link {
    display: block;
    text-align: center;
    margin: 10px 0;
    letter-spacing: 1px;
  }
}