#124A00

CSS

:root {
  --woodland-grass: #124a00;
  --woodland-grass-rgb: 18 74 0;
  --woodland-grass-oklch: oklch(0.359 0.115 139.9);
}

.element {
  color: var(--woodland-grass);
  background-color: hsl(105 100% 15%);
  border-color: oklch(0.359 0.115 139.9);
}

Tailwind CSS v4

@theme {
  --color-woodland-grass: #124a00;
  --color-woodland-grass-50: #e3fee0;
  --color-woodland-grass-100: #d3f2cf;
  --color-woodland-grass-200: #b9e1b4;
  --color-woodland-grass-300: #96c790;
  --color-woodland-grass-400: #79af6d;
  --color-woodland-grass-500: #5a984c;
  --color-woodland-grass-600: #4d8141;
  --color-woodland-grass-700: #3d6734;
  --color-woodland-grass-800: #2e4c23;
  --color-woodland-grass-900: #1f3417;
  --color-woodland-grass-950: #0e2008;
}

SCSS

$woodland-grass: #124a00;
$woodland-grass-rgb: 18, 74, 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);
}