::selection {
  background: indigo;
  color: pink;
}

:root {
  background: #ddd;
  color: #100;
}

:link {
  background: darkslateblue;
  color: oldlace;
}

:visited {
  background: blueviolet;
  color: #eee;
}

:focus {
  outline-color: #100;
}

:any-link:hover {
  background: darkviolet;
  text-decoration-color: #100;
}

mark {
  background: hotpink;
  color: #100;
}