#051A1E

CSS

:root {
  --black-stallion: #051a1e;
  --black-stallion-rgb: 5 26 30;
  --black-stallion-oklch: oklch(0.203 0.028 211.6);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(190 71% 7%);
  border-color: oklch(0.203 0.028 211.6);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #051a1e;
  --color-black-stallion-50: #edf7fa;
  --color-black-stallion-100: #deebee;
  --color-black-stallion-200: #c7d8dc;
  --color-black-stallion-300: #a8bbc0;
  --color-black-stallion-400: #8ca3a8;
  --color-black-stallion-500: #718c91;
  --color-black-stallion-600: #60767b;
  --color-black-stallion-700: #4d5e62;
  --color-black-stallion-800: #374548;
  --color-black-stallion-900: #263032;
  --color-black-stallion-950: #141c1e;
}

SCSS

$black-stallion: #051a1e;
$black-stallion-rgb: 5, 26, 30;
$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);
}