#011419

CSS

:root {
  --black-stallion: #011419;
  --black-stallion-rgb: 1 20 25;
  --black-stallion-oklch: oklch(0.177 0.029 215.5);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(193 92% 5%);
  border-color: oklch(0.177 0.029 215.5);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #011419;
  --color-black-stallion-50: #ecf7fb;
  --color-black-stallion-100: #deeaee;
  --color-black-stallion-200: #c7d8dd;
  --color-black-stallion-300: #a7bbc1;
  --color-black-stallion-400: #8ca3a9;
  --color-black-stallion-500: #718b93;
  --color-black-stallion-600: #60767c;
  --color-black-stallion-700: #4c5e63;
  --color-black-stallion-800: #374549;
  --color-black-stallion-900: #263032;
  --color-black-stallion-950: #141c1e;
}

SCSS

$black-stallion: #011419;
$black-stallion-rgb: 1, 20, 25;
$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);
}