#090B11

CSS

:root {
  --eight-ball: #090b11;
  --eight-ball-rgb: 9 11 17;
  --eight-ball-oklch: oklch(0.15 0.013 270.2);
}

.element {
  color: var(--eight-ball);
  background-color: hsl(225 31% 5%);
  border-color: oklch(0.15 0.013 270.2);
}

Tailwind CSS v4

@theme {
  --color-eight-ball: #090b11;
  --color-eight-ball-50: #f4f5f9;
  --color-eight-ball-100: #e6e8ec;
  --color-eight-ball-200: #d2d4da;
  --color-eight-ball-300: #b5b7be;
  --color-eight-ball-400: #9b9ea7;
  --color-eight-ball-500: #83868f;
  --color-eight-ball-600: #6e7179;
  --color-eight-ball-700: #585b61;
  --color-eight-ball-800: #404247;
  --color-eight-ball-900: #2c2e31;
  --color-eight-ball-950: #191b1d;
}

SCSS

$eight-ball: #090b11;
$eight-ball-rgb: 9, 11, 17;
$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);
}