#190603

CSS

:root {
  --dark-matter: #190603;
  --dark-matter-rgb: 25 6 3;
  --dark-matter-oklch: oklch(0.155 0.037 35.1);
}

.element {
  color: var(--dark-matter);
  background-color: hsl(8 79% 5%);
  border-color: oklch(0.155 0.037 35.1);
}

Tailwind CSS v4

@theme {
  --color-dark-matter: #190603;
  --color-dark-matter-50: #fff2ee;
  --color-dark-matter-100: #f4e4df;
  --color-dark-matter-200: #e3cfc9;
  --color-dark-matter-300: #c9b1aa;
  --color-dark-matter-400: #b39790;
  --color-dark-matter-500: #9d7e76;
  --color-dark-matter-600: #856b64;
  --color-dark-matter-700: #6a5550;
  --color-dark-matter-800: #4e3e3a;
  --color-dark-matter-900: #362b28;
  --color-dark-matter-950: #211816;
}

SCSS

$dark-matter: #190603;
$dark-matter-rgb: 25, 6, 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);
}