#1E4300

CSS

:root {
  --woodland-grass: #1e4300;
  --woodland-grass-rgb: 30 67 0;
  --woodland-grass-oklch: oklch(0.342 0.101 135.4);
}

.element {
  color: var(--woodland-grass);
  background-color: hsl(93 100% 13%);
  border-color: oklch(0.342 0.101 135.4);
}

Tailwind CSS v4

@theme {
  --color-woodland-grass: #1e4300;
  --color-woodland-grass-50: #e8fce1;
  --color-woodland-grass-100: #d8f0d0;
  --color-woodland-grass-200: #c0dfb5;
  --color-woodland-grass-300: #9fc491;
  --color-woodland-grass-400: #84ac6f;
  --color-woodland-grass-500: #68954f;
  --color-woodland-grass-600: #587e44;
  --color-woodland-grass-700: #466536;
  --color-woodland-grass-800: #344a24;
  --color-woodland-grass-900: #233318;
  --color-woodland-grass-950: #121f09;
}

SCSS

$woodland-grass: #1e4300;
$woodland-grass-rgb: 30, 67, 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);
}