Black Hole

CSS

:root {
  --black-hole: #010203;
  --black-hole-rgb: 1 2 3;
  --black-hole-oklch: oklch(0.082 0.008 240.8);
}

.element {
  color: var(--black-hole);
  background-color: hsl(210 50% 1%);
  border-color: oklch(0.082 0.008 240.8);
}

Tailwind CSS v4

@theme {
  --color-black-hole: #010203;
  --color-black-hole-50: #f3f5f7;
  --color-black-hole-100: #e6e8ea;
  --color-black-hole-200: #d1d5d7;
  --color-black-hole-300: #b4b8bb;
  --color-black-hole-400: #9a9fa3;
  --color-black-hole-500: #82878b;
  --color-black-hole-600: #6e7276;
  --color-black-hole-700: #585b5e;
  --color-black-hole-800: #404345;
  --color-black-hole-900: #2c2e30;
  --color-black-hole-950: #191b1c;
}

SCSS

$black-hole: #010203;
$black-hole-rgb: 1, 2, 3;
$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);
}