#001922

CSS

:root {
  --black-stallion: #001922;
  --black-stallion-rgb: 0 25 34;
  --black-stallion-oklch: oklch(0.198 0.037 223.9);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(196 100% 7%);
  border-color: oklch(0.198 0.037 223.9);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #001922;
  --color-black-stallion-50: #ebf8fd;
  --color-black-stallion-100: #dcebf1;
  --color-black-stallion-200: #c4d8e1;
  --color-black-stallion-300: #a4bcc6;
  --color-black-stallion-400: #87a4af;
  --color-black-stallion-500: #6c8c99;
  --color-black-stallion-600: #5b7681;
  --color-black-stallion-700: #495f67;
  --color-black-stallion-800: #34454c;
  --color-black-stallion-900: #243035;
  --color-black-stallion-950: #121c20;
}

SCSS

$black-stallion: #001922;
$black-stallion-rgb: 0, 25, 34;
$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);
}