#0B1A1E

CSS

:root {
  --black-stallion: #0b1a1e;
  --black-stallion-rgb: 11 26 30;
  --black-stallion-oklch: oklch(0.206 0.022 216.8);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(193 46% 8%);
  border-color: oklch(0.206 0.022 216.8);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #0b1a1e;
  --color-black-stallion-50: #eff7f9;
  --color-black-stallion-100: #e0eaed;
  --color-black-stallion-200: #cad7db;
  --color-black-stallion-300: #acbabf;
  --color-black-stallion-400: #91a2a7;
  --color-black-stallion-500: #768a90;
  --color-black-stallion-600: #64757a;
  --color-black-stallion-700: #505d61;
  --color-black-stallion-800: #3a4447;
  --color-black-stallion-900: #282f31;
  --color-black-stallion-950: #161c1d;
}

SCSS

$black-stallion: #0b1a1e;
$black-stallion-rgb: 11, 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);
}