#D32222

CSS

:root {
  --heroic-red: #d32222;
  --heroic-red-rgb: 211 34 34;
  --heroic-red-oklch: oklch(0.558 0.21 27.5);
}

.element {
  color: var(--heroic-red);
  background-color: hsl(0 72% 48%);
  border-color: oklch(0.558 0.21 27.5);
}

Tailwind CSS v4

@theme {
  --color-heroic-red: #d32222;
  --color-heroic-red-50: #ffdfd2;
  --color-heroic-red-100: #ffcebf;
  --color-heroic-red-200: #ffb19f;
  --color-heroic-red-300: #ff8976;
  --color-heroic-red-400: #ff6055;
  --color-heroic-red-500: #f22b2a;
  --color-heroic-red-600: #cc2926;
  --color-heroic-red-700: #a4211e;
  --color-heroic-red-800: #7b1518;
  --color-heroic-red-900: #570e0f;
  --color-heroic-red-950: #3a0003;
}

SCSS

$heroic-red: #d32222;
$heroic-red-rgb: 211, 34, 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);
}