#011115

CSS

:root {
  --black-stallion: #011115;
  --black-stallion-rgb: 1 17 21;
  --black-stallion-oklch: oklch(0.164 0.027 213.4);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(192 91% 4%);
  border-color: oklch(0.164 0.027 213.4);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #011115;
  --color-black-stallion-50: #edf7fa;
  --color-black-stallion-100: #dfeaed;
  --color-black-stallion-200: #c8d7db;
  --color-black-stallion-300: #a9bbc0;
  --color-black-stallion-400: #8da3a8;
  --color-black-stallion-500: #738b91;
  --color-black-stallion-600: #61767b;
  --color-black-stallion-700: #4e5e62;
  --color-black-stallion-800: #384548;
  --color-black-stallion-900: #263032;
  --color-black-stallion-950: #151c1e;
}

SCSS

$black-stallion: #011115;
$black-stallion-rgb: 1, 17, 21;
$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);
}