#612A27

CSS

:root {
  --arcane-red: #612a27;
  --arcane-red-rgb: 97 42 39;
  --arcane-red-oklch: oklch(0.361 0.081 25.1);
}

.element {
  color: var(--arcane-red);
  background-color: hsl(3 43% 27%);
  border-color: oklch(0.361 0.081 25.1);
}

Tailwind CSS v4

@theme {
  --color-arcane-red: #612a27;
  --color-arcane-red-50: #ffede9;
  --color-arcane-red-100: #ffded9;
  --color-arcane-red-200: #f5c8c2;
  --color-arcane-red-300: #dea8a1;
  --color-arcane-red-400: #ca8c86;
  --color-arcane-red-500: #b6716b;
  --color-arcane-red-600: #9a605b;
  --color-arcane-red-700: #7b4c48;
  --color-arcane-red-800: #5b3735;
  --color-arcane-red-900: #402624;
  --color-arcane-red-950: #291413;
}

SCSS

$arcane-red: #612a27;
$arcane-red-rgb: 97, 42, 39;
$arcane-red-light: mix(#fff, $arcane-red, 20%);
$arcane-red-dark: mix(#000, $arcane-red, 20%);

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