#000A0B

CSS

:root {
  --black-hole: #000a0b;
  --black-hole-rgb: 0 10 11;
  --black-hole-oklch: oklch(0.132 0.022 200.5);
}

.element {
  color: var(--black-hole);
  background-color: hsl(185 100% 2%);
  border-color: oklch(0.132 0.022 200.5);
}

Tailwind CSS v4

@theme {
  --color-black-hole: #000a0b;
  --color-black-hole-50: #eef7f8;
  --color-black-hole-100: #e0eaeb;
  --color-black-hole-200: #cad7d8;
  --color-black-hole-300: #abbbbc;
  --color-black-hole-400: #90a3a4;
  --color-black-hole-500: #768b8c;
  --color-black-hole-600: #647676;
  --color-black-hole-700: #505e5f;
  --color-black-hole-800: #3a4545;
  --color-black-hole-900: #283030;
  --color-black-hole-950: #161c1c;
}

SCSS

$black-hole: #000a0b;
$black-hole-rgb: 0, 10, 11;
$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);
}