#131400

CSS

:root {
  --memorial-black: #131400;
  --memorial-black-rgb: 19 20 0;
  --memorial-black-oklch: oklch(0.184 0.041 112.1);
}

.element {
  color: var(--memorial-black);
  background-color: hsl(63 100% 4%);
  border-color: oklch(0.184 0.041 112.1);
}

Tailwind CSS v4

@theme {
  --color-memorial-black: #131400;
  --color-memorial-black-50: #f5f7ea;
  --color-memorial-black-100: #e7eada;
  --color-memorial-black-200: #d4d7c3;
  --color-memorial-black-300: #b7baa3;
  --color-memorial-black-400: #9ea186;
  --color-memorial-black-500: #86896a;
  --color-memorial-black-600: #72745a;
  --color-memorial-black-700: #5b5d48;
  --color-memorial-black-800: #434434;
  --color-memorial-black-900: #2e2f23;
  --color-memorial-black-950: #1b1b12;
}

SCSS

$memorial-black: #131400;
$memorial-black-rgb: 19, 20, 0;
$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);
}