#0A120D

CSS

:root {
  --jedi-night: #0a120d;
  --jedi-night-rgb: 10 18 13;
  --jedi-night-oklch: oklch(0.172 0.016 156.8);
}

.element {
  color: var(--jedi-night);
  background-color: hsl(143 29% 5%);
  border-color: oklch(0.172 0.016 156.8);
}

Tailwind CSS v4

@theme {
  --color-jedi-night: #0a120d;
  --color-jedi-night-50: #f1f7f3;
  --color-jedi-night-100: #e4eae6;
  --color-jedi-night-200: #cfd6d2;
  --color-jedi-night-300: #b1bab4;
  --color-jedi-night-400: #97a19b;
  --color-jedi-night-500: #7e8a82;
  --color-jedi-night-600: #6b746e;
  --color-jedi-night-700: #555d58;
  --color-jedi-night-800: #3e4440;
  --color-jedi-night-900: #2b2f2c;
  --color-jedi-night-950: #181c19;
}

SCSS

$jedi-night: #0a120d;
$jedi-night-rgb: 10, 18, 13;
$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);
}