#10191D

CSS

:root {
  --black-stallion: #10191d;
  --black-stallion-rgb: 16 25 29;
  --black-stallion-oklch: oklch(0.206 0.015 227.1);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(198 29% 9%);
  border-color: oklch(0.206 0.015 227.1);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #10191d;
  --color-black-stallion-50: #f1f6f9;
  --color-black-stallion-100: #e3e9ec;
  --color-black-stallion-200: #ced6d9;
  --color-black-stallion-300: #b0b9be;
  --color-black-stallion-400: #95a0a6;
  --color-black-stallion-500: #7c888e;
  --color-black-stallion-600: #697378;
  --color-black-stallion-700: #545c60;
  --color-black-stallion-800: #3d4446;
  --color-black-stallion-900: #2a2f31;
  --color-black-stallion-950: #171b1d;
}

SCSS

$black-stallion: #10191d;
$black-stallion-rgb: 16, 25, 29;
$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);
}