#170600

CSS

:root {
  --dark-matter: #170600;
  --dark-matter-rgb: 23 6 0;
  --dark-matter-oklch: oklch(0.149 0.038 52.6);
}

.element {
  color: var(--dark-matter);
  background-color: hsl(16 100% 5%);
  border-color: oklch(0.149 0.038 52.6);
}

Tailwind CSS v4

@theme {
  --color-dark-matter: #170600;
  --color-dark-matter-50: #fef3eb;
  --color-dark-matter-100: #f3e5dc;
  --color-dark-matter-200: #e2d0c5;
  --color-dark-matter-300: #c8b3a5;
  --color-dark-matter-400: #b1998a;
  --color-dark-matter-500: #9b806f;
  --color-dark-matter-600: #836c5e;
  --color-dark-matter-700: #69564b;
  --color-dark-matter-800: #4e3f37;
  --color-dark-matter-900: #362b25;
  --color-dark-matter-950: #211914;
}

SCSS

$dark-matter: #170600;
$dark-matter-rgb: 23, 6, 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);
}