#1D4600

CSS

:root {
  --woodland-grass: #1d4600;
  --woodland-grass-rgb: 29 70 0;
  --woodland-grass-oklch: oklch(0.35 0.105 136.4);
}

.element {
  color: var(--woodland-grass);
  background-color: hsl(95 100% 14%);
  border-color: oklch(0.35 0.105 136.4);
}

Tailwind CSS v4

@theme {
  --color-woodland-grass: #1d4600;
  --color-woodland-grass-50: #e7fde0;
  --color-woodland-grass-100: #d7f1cf;
  --color-woodland-grass-200: #bee0b4;
  --color-woodland-grass-300: #9dc590;
  --color-woodland-grass-400: #82ad6e;
  --color-woodland-grass-500: #65964d;
  --color-woodland-grass-600: #567f42;
  --color-woodland-grass-700: #446635;
  --color-woodland-grass-800: #334a24;
  --color-woodland-grass-900: #223418;
  --color-woodland-grass-950: #111f08;
}

SCSS

$woodland-grass: #1d4600;
$woodland-grass-rgb: 29, 70, 0;
$woodland-grass-light: mix(#fff, $woodland-grass, 20%);
$woodland-grass-dark: mix(#000, $woodland-grass, 20%);

.element {
  color: $woodland-grass;
  box-shadow: 0 0 0 2px rgba($woodland-grass, 0.35);
}