#180A09

CSS

:root {
  --dark-matter: #180a09;
  --dark-matter-rgb: 24 10 9;
  --dark-matter-oklch: oklch(0.166 0.025 24.6);
}

.element {
  color: var(--dark-matter);
  background-color: hsl(4 45% 6%);
  border-color: oklch(0.166 0.025 24.6);
}

Tailwind CSS v4

@theme {
  --color-dark-matter: #180a09;
  --color-dark-matter-50: #fcf3f1;
  --color-dark-matter-100: #f0e5e3;
  --color-dark-matter-200: #dfd0ce;
  --color-dark-matter-300: #c4b3b1;
  --color-dark-matter-400: #ad9997;
  --color-dark-matter-500: #96807e;
  --color-dark-matter-600: #7f6c6b;
  --color-dark-matter-700: #665755;
  --color-dark-matter-800: #4b3f3e;
  --color-dark-matter-900: #342b2b;
  --color-dark-matter-950: #1f1918;
}

SCSS

$dark-matter: #180a09;
$dark-matter-rgb: 24, 10, 9;
$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);
}