#091817

CSS

:root {
  --black-stallion: #091817;
  --black-stallion-rgb: 9 24 23;
  --black-stallion-oklch: oklch(0.195 0.021 190.1);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(176 45% 6%);
  border-color: oklch(0.195 0.021 190.1);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #091817;
  --color-black-stallion-50: #eff7f7;
  --color-black-stallion-100: #e0eae9;
  --color-black-stallion-200: #cbd7d6;
  --color-black-stallion-300: #acbbba;
  --color-black-stallion-400: #91a3a1;
  --color-black-stallion-500: #778b89;
  --color-black-stallion-600: #657574;
  --color-black-stallion-700: #515e5d;
  --color-black-stallion-800: #3b4544;
  --color-black-stallion-900: #28302f;
  --color-black-stallion-950: #161c1b;
}

SCSS

$black-stallion: #091817;
$black-stallion-rgb: 9, 24, 23;
$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);
}