#0B1A1B

CSS

:root {
  --black-stallion: #0b1a1b;
  --black-stallion-rgb: 11 26 27;
  --black-stallion-oklch: oklch(0.205 0.021 201.2);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(184 42% 7%);
  border-color: oklch(0.205 0.021 201.2);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #0b1a1b;
  --color-black-stallion-50: #eff7f8;
  --color-black-stallion-100: #e0eaeb;
  --color-black-stallion-200: #cbd7d8;
  --color-black-stallion-300: #acbbbc;
  --color-black-stallion-400: #91a2a3;
  --color-black-stallion-500: #778b8c;
  --color-black-stallion-600: #657576;
  --color-black-stallion-700: #505e5f;
  --color-black-stallion-800: #3a4545;
  --color-black-stallion-900: #282f30;
  --color-black-stallion-950: #161c1c;
}

SCSS

$black-stallion: #0b1a1b;
$black-stallion-rgb: 11, 26, 27;
$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);
}