#006900

CSS

:root {
  --leafy-lush: #006900;
  --leafy-lush-rgb: 0 105 0;
  --leafy-lush-oklch: oklch(0.451 0.154 142.5);
}

.element {
  color: var(--leafy-lush);
  background-color: hsl(120 100% 21%);
  border-color: oklch(0.451 0.154 142.5);
}

Tailwind CSS v4

@theme {
  --color-leafy-lush: #006900;
  --color-leafy-lush-50: #dbffda;
  --color-leafy-lush-100: #c9f6c8;
  --color-leafy-lush-200: #ace6ab;
  --color-leafy-lush-300: #84cc85;
  --color-leafy-lush-400: #64b55e;
  --color-leafy-lush-500: #3c9e37;
  --color-leafy-lush-600: #348630;
  --color-leafy-lush-700: #296b26;
  --color-leafy-lush-800: #204f17;
  --color-leafy-lush-900: #15370e;
  --color-leafy-lush-950: #062102;
}

SCSS

$leafy-lush: #006900;
$leafy-lush-rgb: 0, 105, 0;
$leafy-lush-light: mix(#fff, $leafy-lush, 20%);
$leafy-lush-dark: mix(#000, $leafy-lush, 20%);

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