#180401

CSS

:root {
  --dark-matter: #180401;
  --dark-matter-rgb: 24 4 1;
  --dark-matter-oklch: oklch(0.146 0.041 38);
}

.element {
  color: var(--dark-matter);
  background-color: hsl(8 92% 5%);
  border-color: oklch(0.146 0.041 38);
}

Tailwind CSS v4

@theme {
  --color-dark-matter: #180401;
  --color-dark-matter-50: #fff2ec;
  --color-dark-matter-100: #f5e4de;
  --color-dark-matter-200: #e5cfc7;
  --color-dark-matter-300: #cbb1a8;
  --color-dark-matter-400: #b5978d;
  --color-dark-matter-500: #9f7d73;
  --color-dark-matter-600: #876a61;
  --color-dark-matter-700: #6c554e;
  --color-dark-matter-800: #503e39;
  --color-dark-matter-900: #372a27;
  --color-dark-matter-950: #221815;
}

SCSS

$dark-matter: #180401;
$dark-matter-rgb: 24, 4, 1;
$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);
}