#0A0B10

CSS

:root {
  --eight-ball: #0a0b10;
  --eight-ball-rgb: 10 11 16;
  --eight-ball-oklch: oklch(0.151 0.011 276.2);
}

.element {
  color: var(--eight-ball);
  background-color: hsl(230 23% 5%);
  border-color: oklch(0.151 0.011 276.2);
}

Tailwind CSS v4

@theme {
  --color-eight-ball: #0a0b10;
  --color-eight-ball-50: #f4f5f8;
  --color-eight-ball-100: #e7e7eb;
  --color-eight-ball-200: #d3d4d9;
  --color-eight-ball-300: #b6b7bd;
  --color-eight-ball-400: #9c9ea5;
  --color-eight-ball-500: #84868e;
  --color-eight-ball-600: #707178;
  --color-eight-ball-700: #595a60;
  --color-eight-ball-800: #414246;
  --color-eight-ball-900: #2d2e31;
  --color-eight-ball-950: #1a1a1d;
}

SCSS

$eight-ball: #0a0b10;
$eight-ball-rgb: 10, 11, 16;
$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);
}