#071A23

CSS

:root {
  --black-stallion: #071a23;
  --black-stallion-rgb: 7 26 35;
  --black-stallion-oklch: oklch(0.207 0.031 231);
}

.element {
  color: var(--black-stallion);
  background-color: hsl(199 67% 8%);
  border-color: oklch(0.207 0.031 231);
}

Tailwind CSS v4

@theme {
  --color-black-stallion: #071a23;
  --color-black-stallion-50: #edf7fd;
  --color-black-stallion-100: #deeaf1;
  --color-black-stallion-200: #c8d7df;
  --color-black-stallion-300: #a9bac5;
  --color-black-stallion-400: #8da2ae;
  --color-black-stallion-500: #728a97;
  --color-black-stallion-600: #617580;
  --color-black-stallion-700: #4d5e66;
  --color-black-stallion-800: #38454b;
  --color-black-stallion-900: #262f34;
  --color-black-stallion-950: #141c1f;
}

SCSS

$black-stallion: #071a23;
$black-stallion-rgb: 7, 26, 35;
$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);
}