#D12622

CSS

:root {
  --heroic-red: #d12622;
  --heroic-red-rgb: 209 38 34;
  --heroic-red-oklch: oklch(0.557 0.206 28);
}

.element {
  color: var(--heroic-red);
  background-color: hsl(1 72% 48%);
  border-color: oklch(0.557 0.206 28);
}

Tailwind CSS v4

@theme {
  --color-heroic-red: #d12622;
  --color-heroic-red-50: #ffe0d3;
  --color-heroic-red-100: #ffcebf;
  --color-heroic-red-200: #ffb29f;
  --color-heroic-red-300: #ff8a76;
  --color-heroic-red-400: #ff6255;
  --color-heroic-red-500: #f0302b;
  --color-heroic-red-600: #cb2c26;
  --color-heroic-red-700: #a3241e;
  --color-heroic-red-800: #7a1718;
  --color-heroic-red-900: #560f0f;
  --color-heroic-red-950: #3a0103;
}

SCSS

$heroic-red: #d12622;
$heroic-red-rgb: 209, 38, 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);
}