#121403

CSS

:root {
  --memorial-black: #121403;
  --memorial-black-rgb: 18 20 3;
  --memorial-black-oklch: oklch(0.184 0.034 114.7);
}

.element {
  color: var(--memorial-black);
  background-color: hsl(67 74% 5%);
  border-color: oklch(0.184 0.034 114.7);
}

Tailwind CSS v4

@theme {
  --color-memorial-black: #121403;
  --color-memorial-black-50: #f4f7ec;
  --color-memorial-black-100: #e7e9dd;
  --color-memorial-black-200: #d3d6c6;
  --color-memorial-black-300: #b6baa7;
  --color-memorial-black-400: #9da18b;
  --color-memorial-black-500: #858970;
  --color-memorial-black-600: #71745f;
  --color-memorial-black-700: #5a5d4c;
  --color-memorial-black-800: #424436;
  --color-memorial-black-900: #2e2f25;
  --color-memorial-black-950: #1b1b14;
}

SCSS

$memorial-black: #121403;
$memorial-black-rgb: 18, 20, 3;
$memorial-black-light: mix(#fff, $memorial-black, 20%);
$memorial-black-dark: mix(#000, $memorial-black, 20%);

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