*:where(html) {
  --backdrop-contrast-0: contrast(0);
  --backdrop-contrast-50: contrast(0.5);
  --backdrop-contrast-75: contrast(0.75);
  --backdrop-contrast-100: contrast(1);
  --backdrop-contrast-125: contrast(1.25);
  --backdrop-contrast-150: contrast(1.5);
  --backdrop-contrast-200: contrast(2);
}