#100200

CSS

:root {
  --dark-matter: #100200;
  --dark-matter-rgb: 16 2 0;
  --dark-matter-oklch: oklch(0.119 0.036 41.7);
}

.element {
  color: var(--dark-matter);
  background-color: hsl(8 100% 3%);
  border-color: oklch(0.119 0.036 41.7);
}

Tailwind CSS v4

@theme {
  --color-dark-matter: #100200;
  --color-dark-matter-50: #fff2ed;
  --color-dark-matter-100: #f3e4de;
  --color-dark-matter-200: #e2d0c8;
  --color-dark-matter-300: #c8b2a9;
  --color-dark-matter-400: #b2988e;
  --color-dark-matter-500: #9c7f74;
  --color-dark-matter-600: #846b62;
  --color-dark-matter-700: #6a564e;
  --color-dark-matter-800: #4e3e39;
  --color-dark-matter-900: #362b27;
  --color-dark-matter-950: #211815;
}

SCSS

$dark-matter: #100200;
$dark-matter-rgb: 16, 2, 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);
}