#010605

CSS

:root {
  --black-hole: #010605;
  --black-hole-rgb: 1 6 5;
  --black-hole-oklch: oklch(0.112 0.015 183);
}

.element {
  color: var(--black-hole);
  background-color: hsl(168 71% 1%);
  border-color: oklch(0.112 0.015 183);
}

Tailwind CSS v4

@theme {
  --color-black-hole: #010605;
  --color-black-hole-50: #f1f7f6;
  --color-black-hole-100: #e3eae8;
  --color-black-hole-200: #cdd6d5;
  --color-black-hole-300: #afbab8;
  --color-black-hole-400: #95a29f;
  --color-black-hole-500: #7c8a87;
  --color-black-hole-600: #697472;
  --color-black-hole-700: #545d5b;
  --color-black-hole-800: #3d4443;
  --color-black-hole-900: #2a2f2e;
  --color-black-hole-950: #171c1b;
}

SCSS

$black-hole: #010605;
$black-hole-rgb: 1, 6, 5;
$black-hole-light: mix(#fff, $black-hole, 20%);
$black-hole-dark: mix(#000, $black-hole, 20%);

.element {
  color: $black-hole;
  box-shadow: 0 0 0 2px rgba($black-hole, 0.35);
}