#81A575

CSS

:root {
  --garden-of-eden: #81a575;
  --garden-of-eden-rgb: 129 165 117;
  --garden-of-eden-oklch: oklch(0.682 0.079 138);
}

.element {
  color: var(--garden-of-eden);
  background-color: hsl(105 21% 55%);
  border-color: oklch(0.682 0.079 138);
}

Tailwind CSS v4

@theme {
  --color-garden-of-eden: #81a575;
  --color-garden-of-eden-50: #eafbe6;
  --color-garden-of-eden-100: #daefd6;
  --color-garden-of-eden-200: #c3ddbd;
  --color-garden-of-eden-300: #a2c29c;
  --color-garden-of-eden-400: #88aa7c;
  --color-garden-of-eden-500: #6c935f;
  --color-garden-of-eden-600: #5c7c51;
  --color-garden-of-eden-700: #496340;
  --color-garden-of-eden-800: #36492d;
  --color-garden-of-eden-900: #25321e;
  --color-garden-of-eden-950: #131e0e;
}

SCSS

$garden-of-eden: #81a575;
$garden-of-eden-rgb: 129, 165, 117;
$garden-of-eden-light: mix(#fff, $garden-of-eden, 20%);
$garden-of-eden-dark: mix(#000, $garden-of-eden, 20%);

.element {
  color: $garden-of-eden;
  box-shadow: 0 0 0 2px rgba($garden-of-eden, 0.35);
}