#004C00

CSS

:root {
  --woodland-grass: #004c00;
  --woodland-grass-rgb: 0 76 0;
  --woodland-grass-oklch: oklch(0.361 0.123 142.5);
}

.element {
  color: var(--woodland-grass);
  background-color: hsl(120 100% 15%);
  border-color: oklch(0.361 0.123 142.5);
}

Tailwind CSS v4

@theme {
  --color-woodland-grass: #004c00;
  --color-woodland-grass-50: #e1ffe0;
  --color-woodland-grass-100: #d0f3cf;
  --color-woodland-grass-200: #b5e3b4;
  --color-woodland-grass-300: #90c890;
  --color-woodland-grass-400: #72b16d;
  --color-woodland-grass-500: #519a4b;
  --color-woodland-grass-600: #458241;
  --color-woodland-grass-700: #376833;
  --color-woodland-grass-800: #294d22;
  --color-woodland-grass-900: #1b3517;
  --color-woodland-grass-950: #0c2008;
}

SCSS

$woodland-grass: #004c00;
$woodland-grass-rgb: 0, 76, 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);
}