#170700

CSS

:root {
  --dark-matter: #170700;
  --dark-matter-rgb: 23 7 0;
  --dark-matter-oklch: oklch(0.152 0.037 56.7);
}

.element {
  color: var(--dark-matter);
  background-color: hsl(18 100% 5%);
  border-color: oklch(0.152 0.037 56.7);
}

Tailwind CSS v4

@theme {
  --color-dark-matter: #170700;
  --color-dark-matter-50: #fef3eb;
  --color-dark-matter-100: #f2e5dc;
  --color-dark-matter-200: #e1d1c5;
  --color-dark-matter-300: #c6b3a5;
  --color-dark-matter-400: #b0998a;
  --color-dark-matter-500: #9a806f;
  --color-dark-matter-600: #826d5e;
  --color-dark-matter-700: #68574b;
  --color-dark-matter-800: #4d3f36;
  --color-dark-matter-900: #352b25;
  --color-dark-matter-950: #211914;
}

SCSS

$dark-matter: #170700;
$dark-matter-rgb: 23, 7, 0;
$dark-matter-light: mix(#fff, $dark-matter, 20%);
$dark-matter-dark: mix(#000, $dark-matter, 20%);

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