#00070B

CSS

:root {
  --eight-ball: #00070b;
  --eight-ball-rgb: 0 7 11;
  --eight-ball-oklch: oklch(0.119 0.022 221.5);
}

.element {
  color: var(--eight-ball);
  background-color: hsl(202 100% 2%);
  border-color: oklch(0.119 0.022 221.5);
}

Tailwind CSS v4

@theme {
  --color-eight-ball: #00070b;
  --color-eight-ball-50: #eff7fa;
  --color-eight-ball-100: #e0eaed;
  --color-eight-ball-200: #cbd6db;
  --color-eight-ball-300: #acbac0;
  --color-eight-ball-400: #91a2a8;
  --color-eight-ball-500: #778a91;
  --color-eight-ball-600: #65757a;
  --color-eight-ball-700: #505d62;
  --color-eight-ball-800: #3a4448;
  --color-eight-ball-900: #282f32;
  --color-eight-ball-950: #161c1e;
}

SCSS

$eight-ball: #00070b;
$eight-ball-rgb: 0, 7, 11;
$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);
}