#06090F

CSS

:root {
  --eight-ball: #06090f;
  --eight-ball-rgb: 6 9 15;
  --eight-ball-oklch: oklch(0.139 0.015 260.7);
}

.element {
  color: var(--eight-ball);
  background-color: hsl(220 43% 4%);
  border-color: oklch(0.139 0.015 260.7);
}

Tailwind CSS v4

@theme {
  --color-eight-ball: #06090f;
  --color-eight-ball-50: #f3f5f9;
  --color-eight-ball-100: #e5e8ed;
  --color-eight-ball-200: #d1d4db;
  --color-eight-ball-300: #b3b7bf;
  --color-eight-ball-400: #9a9fa7;
  --color-eight-ball-500: #818690;
  --color-eight-ball-600: #6d727a;
  --color-eight-ball-700: #575b62;
  --color-eight-ball-800: #3f4348;
  --color-eight-ball-900: #2c2e32;
  --color-eight-ball-950: #191b1e;
}

SCSS

$eight-ball: #06090f;
$eight-ball-rgb: 6, 9, 15;
$eight-ball-light: mix(#fff, $eight-ball, 20%);
$eight-ball-dark: mix(#000, $eight-ball, 20%);

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