#06070A

CSS

:root {
  --eight-ball: #06070a;
  --eight-ball-rgb: 6 7 10;
  --eight-ball-oklch: oklch(0.129 0.008 268.5);
}

.element {
  color: var(--eight-ball);
  background-color: hsl(225 25% 3%);
  border-color: oklch(0.129 0.008 268.5);
}

Tailwind CSS v4

@theme {
  --color-eight-ball: #06070a;
  --color-eight-ball-50: #f4f5f7;
  --color-eight-ball-100: #e7e8ea;
  --color-eight-ball-200: #d3d4d8;
  --color-eight-ball-300: #b6b7bb;
  --color-eight-ball-400: #9c9ea3;
  --color-eight-ball-500: #84868b;
  --color-eight-ball-600: #707176;
  --color-eight-ball-700: #595b5e;
  --color-eight-ball-800: #414245;
  --color-eight-ball-900: #2d2e30;
  --color-eight-ball-950: #1a1b1c;
}

SCSS

$eight-ball: #06070a;
$eight-ball-rgb: 6, 7, 10;
$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);
}