nav {
  animation: fadein 2s;
}
@keyframes fadein {
  from {
    transform: translateY(-20%);
    opacity: 0;
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

a {
  transition: 0.7s;
}

a:hover {
  transform: scale(1.1);
}