#D22422

CSS

:root {
  --heroic-red: #d22422;
  --heroic-red-rgb: 210 36 34;
  --heroic-red-oklch: oklch(0.557 0.208 27.7);
}

.element {
  color: var(--heroic-red);
  background-color: hsl(1 72% 48%);
  border-color: oklch(0.557 0.208 27.7);
}

Tailwind CSS v4

@theme {
  --color-heroic-red: #d22422;
  --color-heroic-red-50: #ffe0d2;
  --color-heroic-red-100: #ffcebf;
  --color-heroic-red-200: #ffb19f;
  --color-heroic-red-300: #ff8976;
  --color-heroic-red-400: #ff6155;
  --color-heroic-red-500: #f12e2b;
  --color-heroic-red-600: #cb2a26;
  --color-heroic-red-700: #a4221e;
  --color-heroic-red-800: #7b1618;
  --color-heroic-red-900: #570f0f;
  --color-heroic-red-950: #3a0003;
}

SCSS

$heroic-red: #d22422;
$heroic-red-rgb: 210, 36, 34;
$heroic-red-light: mix(#fff, $heroic-red, 20%);
$heroic-red-dark: mix(#000, $heroic-red, 20%);

.element {
  color: $heroic-red;
  box-shadow: 0 0 0 2px rgba($heroic-red, 0.35);
}