#040B0E

CSS

:root {
  --eight-ball: #040b0e;
  --eight-ball-rgb: 4 11 14;
  --eight-ball-oklch: oklch(0.143 0.015 222.2);
}

.element {
  color: var(--eight-ball);
  background-color: hsl(198 56% 4%);
  border-color: oklch(0.143 0.015 222.2);
}

Tailwind CSS v4

@theme {
  --color-eight-ball: #040b0e;
  --color-eight-ball-50: #f1f6f8;
  --color-eight-ball-100: #e3e9eb;
  --color-eight-ball-200: #ced6d9;
  --color-eight-ball-300: #b0b9bd;
  --color-eight-ball-400: #96a1a5;
  --color-eight-ball-500: #7c898d;
  --color-eight-ball-600: #697477;
  --color-eight-ball-700: #545c60;
  --color-eight-ball-800: #3d4446;
  --color-eight-ball-900: #2a2f30;
  --color-eight-ball-950: #181b1d;
}

SCSS

$eight-ball: #040b0e;
$eight-ball-rgb: 4, 11, 14;
$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);
}