#000704

CSS

:root {
  --black-hole: #000704;
  --black-hole-rgb: 0 7 4;
  --black-hole-oklch: oklch(0.114 0.023 169.4);
}

.element {
  color: var(--black-hole);
  background-color: hsl(154 100% 1%);
  border-color: oklch(0.114 0.023 169.4);
}

Tailwind CSS v4

@theme {
  --color-black-hole: #000704;
  --color-black-hole-50: #eff7f4;
  --color-black-hole-100: #e1eae7;
  --color-black-hole-200: #cbd8d3;
  --color-black-hole-300: #acbbb6;
  --color-black-hole-400: #92a39c;
  --color-black-hole-500: #788b84;
  --color-black-hole-600: #66766f;
  --color-black-hole-700: #515e59;
  --color-black-hole-800: #3b4541;
  --color-black-hole-900: #29302d;
  --color-black-hole-950: #161c1a;
}

SCSS

$black-hole: #000704;
$black-hole-rgb: 0, 7, 4;
$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);
}