#140205

CSS

:root {
  --dark-matter: #140205;
  --dark-matter-rgb: 20 2 5;
  --dark-matter-oklch: oklch(0.132 0.04 8.8);
}

.element {
  color: var(--dark-matter);
  background-color: hsl(350 82% 4%);
  border-color: oklch(0.132 0.04 8.8);
}

Tailwind CSS v4

@theme {
  --color-dark-matter: #140205;
  --color-dark-matter-50: #fff1f2;
  --color-dark-matter-100: #f5e3e4;
  --color-dark-matter-200: #e5ced0;
  --color-dark-matter-300: #cbafb2;
  --color-dark-matter-400: #b49599;
  --color-dark-matter-500: #9e7c81;
  --color-dark-matter-600: #86696d;
  --color-dark-matter-700: #6b5457;
  --color-dark-matter-800: #4f3d40;
  --color-dark-matter-900: #372a2c;
  --color-dark-matter-950: #221719;
}

SCSS

$dark-matter: #140205;
$dark-matter-rgb: 20, 2, 5;
$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);
}