#001015

CSS

:root {
  --black-stallion: #001015;
  --black-stallion-rgb: 0 16 21;
  --black-stallion-oklch: oklch(0.16 0.028 216.7);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(194 100% 4%);
  border-color: oklch(0.16 0.028 216.7);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #001015;
  --color-black-stallion-50: #edf7fb;
  --color-black-stallion-100: #deeaee;
  --color-black-stallion-200: #c8d7dc;
  --color-black-stallion-300: #a8bbc1;
  --color-black-stallion-400: #8ca3a9;
  --color-black-stallion-500: #718b92;
  --color-black-stallion-600: #60767c;
  --color-black-stallion-700: #4d5e63;
  --color-black-stallion-800: #374548;
  --color-black-stallion-900: #263032;
  --color-black-stallion-950: #141c1e;
}

SCSS

$black-stallion: #001015;
$black-stallion-rgb: 0, 16, 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);
}