#060B0F

CSS

:root {
  --eight-ball: #060b0f;
  --eight-ball-rgb: 6 11 15;
  --eight-ball-oklch: oklch(0.146 0.013 239.8);
}

.element {
  color: var(--eight-ball);
  background-color: hsl(207 43% 4%);
  border-color: oklch(0.146 0.013 239.8);
}

Tailwind CSS v4

@theme {
  --color-eight-ball: #060b0f;
  --color-eight-ball-50: #f2f6f8;
  --color-eight-ball-100: #e4e8ec;
  --color-eight-ball-200: #d0d5d9;
  --color-eight-ball-300: #b2b8bd;
  --color-eight-ball-400: #98a0a5;
  --color-eight-ball-500: #7f878e;
  --color-eight-ball-600: #6c7378;
  --color-eight-ball-700: #565c60;
  --color-eight-ball-800: #3e4346;
  --color-eight-ball-900: #2b2e31;
  --color-eight-ball-950: #181b1d;
}

SCSS

$eight-ball: #060b0f;
$eight-ball-rgb: 6, 11, 15;
$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);
}