#558041

CSS

:root {
  --shepherd-s-green: #558041;
  --shepherd-s-green-rgb: 85 128 65;
  --shepherd-s-green-oklch: oklch(0.553 0.103 136.5);
}

.element {
  color: var(--shepherd-s-green);
  background-color: hsl(101 33% 38%);
  border-color: oklch(0.553 0.103 136.5);
}

Tailwind CSS v4

@theme {
  --color-shepherd-s-green: #558041;
  --color-shepherd-s-green-50: #e7fde0;
  --color-shepherd-s-green-100: #d7f1d0;
  --color-shepherd-s-green-200: #bfdfb5;
  --color-shepherd-s-green-300: #9dc591;
  --color-shepherd-s-green-400: #82ad6f;
  --color-shepherd-s-green-500: #65964f;
  --color-shepherd-s-green-600: #567f43;
  --color-shepherd-s-green-700: #446535;
  --color-shepherd-s-green-800: #334a24;
  --color-shepherd-s-green-900: #233318;
  --color-shepherd-s-green-950: #121f09;
}

SCSS

$shepherd-s-green: #558041;
$shepherd-s-green-rgb: 85, 128, 65;
$shepherd-s-green-light: mix(#fff, $shepherd-s-green, 20%);
$shepherd-s-green-dark: mix(#000, $shepherd-s-green, 20%);

.element {
  color: $shepherd-s-green;
  box-shadow: 0 0 0 2px rgba($shepherd-s-green, 0.35);
}