#020307

CSS

:root {
  --eight-ball: #020307;
  --eight-ball-rgb: 2 3 7;
  --eight-ball-oklch: oklch(0.098 0.015 268.1);
}

.element {
  color: var(--eight-ball);
  background-color: hsl(228 56% 2%);
  border-color: oklch(0.098 0.015 268.1);
}

Tailwind CSS v4

@theme {
  --color-eight-ball: #020307;
  --color-eight-ball-50: #f3f5fa;
  --color-eight-ball-100: #e6e8ed;
  --color-eight-ball-200: #d1d4db;
  --color-eight-ball-300: #b4b7c0;
  --color-eight-ball-400: #9a9ea8;
  --color-eight-ball-500: #828691;
  --color-eight-ball-600: #6e717a;
  --color-eight-ball-700: #585b62;
  --color-eight-ball-800: #404248;
  --color-eight-ball-900: #2c2e32;
  --color-eight-ball-950: #191b1e;
}

SCSS

$eight-ball: #020307;
$eight-ball-rgb: 2, 3, 7;
$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);
}