#10191F

CSS

:root {
  --black-stallion: #10191f;
  --black-stallion-rgb: 16 25 31;
  --black-stallion-oklch: oklch(0.207 0.018 237.9);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(204 32% 9%);
  border-color: oklch(0.207 0.018 237.9);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #10191f;
  --color-black-stallion-50: #f1f6fa;
  --color-black-stallion-100: #e3e9ed;
  --color-black-stallion-200: #ced5db;
  --color-black-stallion-300: #b0b9c0;
  --color-black-stallion-400: #95a0a8;
  --color-black-stallion-500: #7c8891;
  --color-black-stallion-600: #69737a;
  --color-black-stallion-700: #545c62;
  --color-black-stallion-800: #3d4348;
  --color-black-stallion-900: #2a2f32;
  --color-black-stallion-950: #171b1e;
}

SCSS

$black-stallion: #10191f;
$black-stallion-rgb: 16, 25, 31;
$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);
}