#070A0D

CSS

:root {
  --eight-ball: #070a0d;
  --eight-ball-rgb: 7 10 13;
  --eight-ball-oklch: oklch(0.143 0.009 245.7);
}

.element {
  color: var(--eight-ball);
  background-color: hsl(210 30% 4%);
  border-color: oklch(0.143 0.009 245.7);
}

Tailwind CSS v4

@theme {
  --color-eight-ball: #070a0d;
  --color-eight-ball-50: #f3f5f7;
  --color-eight-ball-100: #e6e8eb;
  --color-eight-ball-200: #d1d5d8;
  --color-eight-ball-300: #b4b8bc;
  --color-eight-ball-400: #9a9fa3;
  --color-eight-ball-500: #82878c;
  --color-eight-ball-600: #6e7276;
  --color-eight-ball-700: #585b5e;
  --color-eight-ball-800: #404345;
  --color-eight-ball-900: #2c2e30;
  --color-eight-ball-950: #191b1c;
}

SCSS

$eight-ball: #070a0d;
$eight-ball-rgb: 7, 10, 13;
$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);
}