#160703

CSS

:root {
  --dark-matter: #160703;
  --dark-matter-rgb: 22 7 3;
  --dark-matter-oklch: oklch(0.152 0.03 42.1);
}

.element {
  color: var(--dark-matter);
  background-color: hsl(13 76% 5%);
  border-color: oklch(0.152 0.03 42.1);
}

Tailwind CSS v4

@theme {
  --color-dark-matter: #160703;
  --color-dark-matter-50: #fdf3ee;
  --color-dark-matter-100: #f1e5e0;
  --color-dark-matter-200: #e0d0ca;
  --color-dark-matter-300: #c6b3ab;
  --color-dark-matter-400: #af9991;
  --color-dark-matter-500: #988077;
  --color-dark-matter-600: #816c65;
  --color-dark-matter-700: #675750;
  --color-dark-matter-800: #4c3f3b;
  --color-dark-matter-900: #352b28;
  --color-dark-matter-950: #201916;
}

SCSS

$dark-matter: #160703;
$dark-matter-rgb: 22, 7, 3;
$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);
}