::selection {
  text-shadow: 0 -1ex 0 hotpink;
  background: hotpink;
  color: black;
}

:root {
  color: #111;
  background-color: skyblue;
  background-image: linear-gradient(.2turn, powderblue 0%, powderblue 12%, deepskyblue 12%);
}

:any-link {
  color: #111;
}

:focus {
  outline: thick groove;
  text-shadow:
    0 -1vmax 0 coral,
    0 -1vmin 0 coral;
}

@media (prefers-reduced-motion: no-preference) {
  :any-link {
    transition: text-shadow 300ms ease-out;
  }
}