#D02822

CSS

:root {
  --heroic-red: #d02822;
  --heroic-red-rgb: 208 40 34;
  --heroic-red-oklch: oklch(0.556 0.204 28.3);
}

.element {
  color: var(--heroic-red);
  background-color: hsl(2 72% 47%);
  border-color: oklch(0.556 0.204 28.3);
}

Tailwind CSS v4

@theme {
  --color-heroic-red: #d02822;
  --color-heroic-red-50: #ffe0d3;
  --color-heroic-red-100: #ffcfbf;
  --color-heroic-red-200: #ffb2a0;
  --color-heroic-red-300: #ff8b76;
  --color-heroic-red-400: #ff6355;
  --color-heroic-red-500: #ef332b;
  --color-heroic-red-600: #ca2e26;
  --color-heroic-red-700: #a3251e;
  --color-heroic-red-800: #7a1818;
  --color-heroic-red-900: #56100f;
  --color-heroic-red-950: #390103;
}

SCSS

$heroic-red: #d02822;
$heroic-red-rgb: 208, 40, 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);
}