#1C3F00

CSS

:root {
  --woodland-grass: #1c3f00;
  --woodland-grass-rgb: 28 63 0;
  --woodland-grass-oklch: oklch(0.328 0.096 135.3);
}

.element {
  color: var(--woodland-grass);
  background-color: hsl(93 100% 12%);
  border-color: oklch(0.328 0.096 135.3);
}

Tailwind CSS v4

@theme {
  --color-woodland-grass: #1c3f00;
  --color-woodland-grass-50: #e8fce1;
  --color-woodland-grass-100: #d9f0d1;
  --color-woodland-grass-200: #c1dfb6;
  --color-woodland-grass-300: #a0c393;
  --color-woodland-grass-400: #85ac72;
  --color-woodland-grass-500: #699452;
  --color-woodland-grass-600: #597e46;
  --color-woodland-grass-700: #476537;
  --color-woodland-grass-800: #354a26;
  --color-woodland-grass-900: #243319;
  --color-woodland-grass-950: #131f0a;
}

SCSS

$woodland-grass: #1c3f00;
$woodland-grass-rgb: 28, 63, 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);
}