#06070C

CSS

:root {
  --eight-ball: #06070c;
  --eight-ball-rgb: 6 7 12;
  --eight-ball-oklch: oklch(0.13 0.012 274);
}

.element {
  color: var(--eight-ball);
  background-color: hsl(230 33% 4%);
  border-color: oklch(0.13 0.012 274);
}

Tailwind CSS v4

@theme {
  --color-eight-ball: #06070c;
  --color-eight-ball-50: #f4f5f9;
  --color-eight-ball-100: #e7e8ec;
  --color-eight-ball-200: #d3d4d9;
  --color-eight-ball-300: #b5b7be;
  --color-eight-ball-400: #9c9ea6;
  --color-eight-ball-500: #83868e;
  --color-eight-ball-600: #6f7178;
  --color-eight-ball-700: #595a60;
  --color-eight-ball-800: #414247;
  --color-eight-ball-900: #2d2e31;
  --color-eight-ball-950: #1a1a1d;
}

SCSS

$eight-ball: #06070c;
$eight-ball-rgb: 6, 7, 12;
$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);
}