#051A21

CSS

:root {
  --black-stallion: #051a21;
  --black-stallion-rgb: 5 26 33;
  --black-stallion-oklch: oklch(0.204 0.031 222.4);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(195 74% 7%);
  border-color: oklch(0.204 0.031 222.4);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #051a21;
  --color-black-stallion-50: #ecf7fc;
  --color-black-stallion-100: #deeaf0;
  --color-black-stallion-200: #c7d7de;
  --color-black-stallion-300: #a8bbc3;
  --color-black-stallion-400: #8ca3ac;
  --color-black-stallion-500: #718b95;
  --color-black-stallion-600: #60767e;
  --color-black-stallion-700: #4c5e65;
  --color-black-stallion-800: #37454a;
  --color-black-stallion-900: #263033;
  --color-black-stallion-950: #141c1f;
}

SCSS

$black-stallion: #051a21;
$black-stallion-rgb: 5, 26, 33;
$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);
}