#81A56D

CSS

:root {
  --garden-of-eden: #81a56d;
  --garden-of-eden-rgb: 129 165 109;
  --garden-of-eden-oklch: oklch(0.681 0.089 134.8);
}

.element {
  color: var(--garden-of-eden);
  background-color: hsl(99 24% 54%);
  border-color: oklch(0.681 0.089 134.8);
}

Tailwind CSS v4

@theme {
  --color-garden-of-eden: #81a56d;
  --color-garden-of-eden-50: #eafce3;
  --color-garden-of-eden-100: #dbefd2;
  --color-garden-of-eden-200: #c3deb9;
  --color-garden-of-eden-300: #a3c296;
  --color-garden-of-eden-400: #88aa75;
  --color-garden-of-eden-500: #6d9356;
  --color-garden-of-eden-600: #5c7d4a;
  --color-garden-of-eden-700: #49643a;
  --color-garden-of-eden-800: #364928;
  --color-garden-of-eden-900: #25331b;
  --color-garden-of-eden-950: #141e0b;
}

SCSS

$garden-of-eden: #81a56d;
$garden-of-eden-rgb: 129, 165, 109;
$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);
}