inset-shadow {
  outline: 0 0 50 50 / 0;
  dx: 0;
  dy: 10;
  color: red;
}

inset-shadow {
  outline: 0 0 50 50 / 0;
  dx: 10;
  dy: 0;
  color: blue;
}

inset-shadow {
  outline: 0 0 50 50 / 0;
  dx: -10;
  dy: 0;
  color: green;
}

inset-shadow {
  outline: 0 0 50 50 / 0;
  dx: 0;
  dy: -10;
  color: cyan;
}