#001815

CSS

:root {
  --jedi-night: #001815;
  --jedi-night-rgb: 0 24 21;
  --jedi-night-oklch: oklch(0.188 0.033 184.2);
}

.element {
  color: var(--jedi-night);
  background-color: hsl(173 100% 5%);
  border-color: oklch(0.188 0.033 184.2);
}

Tailwind CSS v4

@theme {
  --color-jedi-night: #001815;
  --color-jedi-night-50: #ebf8f6;
  --color-jedi-night-100: #dcece9;
  --color-jedi-night-200: #c5d9d6;
  --color-jedi-night-300: #a5bdba;
  --color-jedi-night-400: #89a5a1;
  --color-jedi-night-500: #6e8e89;
  --color-jedi-night-600: #5d7874;
  --color-jedi-night-700: #4a605c;
  --color-jedi-night-800: #364643;
  --color-jedi-night-900: #25312e;
  --color-jedi-night-950: #131d1b;
}

SCSS

$jedi-night: #001815;
$jedi-night-rgb: 0, 24, 21;
$jedi-night-light: mix(#fff, $jedi-night, 20%);
$jedi-night-dark: mix(#000, $jedi-night, 20%);

.element {
  color: $jedi-night;
  box-shadow: 0 0 0 2px rgba($jedi-night, 0.35);
}