#170400

CSS

:root {
  --dark-matter: #170400;
  --dark-matter-rgb: 23 4 0;
  --dark-matter-oklch: oklch(0.143 0.041 44.5);
}

.element {
  color: var(--dark-matter);
  background-color: hsl(10 100% 5%);
  border-color: oklch(0.143 0.041 44.5);
}

Tailwind CSS v4

@theme {
  --color-dark-matter: #170400;
  --color-dark-matter-50: #fff2eb;
  --color-dark-matter-100: #f4e4dd;
  --color-dark-matter-200: #e4cfc6;
  --color-dark-matter-300: #cab1a6;
  --color-dark-matter-400: #b4978b;
  --color-dark-matter-500: #9e7e70;
  --color-dark-matter-600: #866b5f;
  --color-dark-matter-700: #6b554c;
  --color-dark-matter-800: #4f3e37;
  --color-dark-matter-900: #372b26;
  --color-dark-matter-950: #221814;
}

SCSS

$dark-matter: #170400;
$dark-matter-rgb: 23, 4, 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);
}