::selection {
  background: purple;
  color: plum;
}

:root {
  color: #313;
  background-color: violet;
  background-image: conic-gradient(violet, deeppink, deeppink, violet);
}

:any-link {
  color: #313;
  background-color: violet;
  background-image: conic-gradient(plum, violet, transparent, transparent);
}

:focus {
  background: transparent;
  outline: thick dotted;
  box-shadow: 0 0 0 1vmax;
}