body{
  font-family: Arial;
  margin:40px;
}

nav a{
  margin-right:20px;
}

::view-transition-old(root) {
  animation: fade-out 0.15s ease;
}

::view-transition-new(root) {
  animation: fade-in 0.15s ease;
}

@keyframes fade-out {
  from { opacity: 1 }
  to   { opacity: 0 }
}

@keyframes fade-in {
  from { opacity: 0 }
  to   { opacity: 1 }
}