#81A574

CSS

:root {
  --garden-of-eden: #81a574;
  --garden-of-eden-rgb: 129 165 116;
  --garden-of-eden-oklch: oklch(0.682 0.08 137.6);
}

.element {
  color: var(--garden-of-eden);
  background-color: hsl(104 21% 55%);
  border-color: oklch(0.682 0.08 137.6);
}

Tailwind CSS v4

@theme {
  --color-garden-of-eden: #81a574;
  --color-garden-of-eden-50: #eafbe5;
  --color-garden-of-eden-100: #dbefd6;
  --color-garden-of-eden-200: #c3ddbd;
  --color-garden-of-eden-300: #a2c29b;
  --color-garden-of-eden-400: #88aa7b;
  --color-garden-of-eden-500: #6c935e;
  --color-garden-of-eden-600: #5c7c50;
  --color-garden-of-eden-700: #49633f;
  --color-garden-of-eden-800: #36492c;
  --color-garden-of-eden-900: #25321e;
  --color-garden-of-eden-950: #131e0e;
}

SCSS

$garden-of-eden: #81a574;
$garden-of-eden-rgb: 129, 165, 116;
$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);
}