@layer basetheme, customtheme;

@layer customtheme {
  p {
    color: white;
    border-color: color(from rebeccapurple srgb calc(r - 0.15) calc(g - 0.15) calc(b - 0.15));
    background: rebeccapurple;
  }
}

@layer basetheme {
  p {
    padding: 1rem;
    border: 3px solid black;
    background: grey;
    color: black;
  }
}