#081929

CSS

:root {
  --the-count-s-black: #081929;
  --the-count-s-black-rgb: 8 25 41;
  --the-count-s-black-oklch: oklch(0.208 0.039 248.8);
}

.element {
  color: var(--the-count-s-black);
  background-color: hsl(209 67% 10%);
  border-color: oklch(0.208 0.039 248.8);
}

Tailwind CSS v4

@theme {
  --color-the-count-s-black: #081929;
  --color-the-count-s-black-50: #edf6ff;
  --color-the-count-s-black-100: #dfe9f5;
  --color-the-count-s-black-200: #c8d6e5;
  --color-the-count-s-black-300: #a9b9cb;
  --color-the-count-s-black-400: #8da1b5;
  --color-the-count-s-black-500: #7289a0;
  --color-the-count-s-black-600: #617487;
  --color-the-count-s-black-700: #4d5d6c;
  --color-the-count-s-black-800: #384450;
  --color-the-count-s-black-900: #262f37;
  --color-the-count-s-black-950: #141b22;
}

SCSS

$the-count-s-black: #081929;
$the-count-s-black-rgb: 8, 25, 41;
$the-count-s-black-light: mix(#fff, $the-count-s-black, 20%);
$the-count-s-black-dark: mix(#000, $the-count-s-black, 20%);

.element {
  color: $the-count-s-black;
  box-shadow: 0 0 0 2px rgba($the-count-s-black, 0.35);
}