#051316

CSS

:root {
  --black-stallion: #051316;
  --black-stallion-rgb: 5 19 22;
  --black-stallion-oklch: oklch(0.175 0.021 212.3);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(191 63% 5%);
  border-color: oklch(0.175 0.021 212.3);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #051316;
  --color-black-stallion-50: #eff7f9;
  --color-black-stallion-100: #e0eaec;
  --color-black-stallion-200: #cbd7da;
  --color-black-stallion-300: #acbabe;
  --color-black-stallion-400: #91a2a6;
  --color-black-stallion-500: #778a8e;
  --color-black-stallion-600: #657579;
  --color-black-stallion-700: #505e60;
  --color-black-stallion-800: #3a4546;
  --color-black-stallion-900: #282f31;
  --color-black-stallion-950: #161c1d;
}

SCSS

$black-stallion: #051316;
$black-stallion-rgb: 5, 19, 22;
$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);
}