#001313

CSS

:root {
  --black-stallion: #001313;
  --black-stallion-rgb: 0 19 19;
  --black-stallion-oklch: oklch(0.169 0.029 194.8);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(180 100% 4%);
  border-color: oklch(0.169 0.029 194.8);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #001313;
  --color-black-stallion-50: #ecf8f8;
  --color-black-stallion-100: #ddebeb;
  --color-black-stallion-200: #c7d8d8;
  --color-black-stallion-300: #a7bcbc;
  --color-black-stallion-400: #8ca4a4;
  --color-black-stallion-500: #708c8c;
  --color-black-stallion-600: #5f7776;
  --color-black-stallion-700: #4c5f5f;
  --color-black-stallion-800: #374645;
  --color-black-stallion-900: #263030;
  --color-black-stallion-950: #141c1c;
}

SCSS

$black-stallion: #001313;
$black-stallion-rgb: 0, 19, 19;
$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);
}