#081923

CSS

:root {
  --black-stallion: #081923;
  --black-stallion-rgb: 8 25 35;
  --black-stallion-oklch: oklch(0.204 0.03 236.5);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(202 63% 8%);
  border-color: oklch(0.204 0.03 236.5);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #081923;
  --color-black-stallion-50: #eef7fd;
  --color-black-stallion-100: #dfeaf1;
  --color-black-stallion-200: #c9d6e0;
  --color-black-stallion-300: #aabac5;
  --color-black-stallion-400: #8ea2ae;
  --color-black-stallion-500: #748a98;
  --color-black-stallion-600: #627581;
  --color-black-stallion-700: #4e5d67;
  --color-black-stallion-800: #38444b;
  --color-black-stallion-900: #272f34;
  --color-black-stallion-950: #151c20;
}

SCSS

$black-stallion: #081923;
$black-stallion-rgb: 8, 25, 35;
$black-stallion-light: mix(#fff, $black-stallion, 20%);
$black-stallion-dark: mix(#000, $black-stallion, 20%);

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