#65AC43

CSS

:root {
  --grass: #65ac43;
  --grass-rgb: 101 172 67;
  --grass-oklch: oklch(0.675 0.157 136.9);
}

.element {
  color: var(--grass);
  background-color: hsl(101 44% 47%);
  border-color: oklch(0.675 0.157 136.9);
}

Tailwind CSS v4

@theme {
  --color-grass: #65ac43;
  --color-grass-50: #dfffd6;
  --color-grass-100: #cef5c3;
  --color-grass-200: #b2e5a4;
  --color-grass-300: #8dcb7b;
  --color-grass-400: #70b351;
  --color-grass-500: #4e9c20;
  --color-grass-600: #43841e;
  --color-grass-700: #356a18;
  --color-grass-800: #284e0b;
  --color-grass-900: #1b3607;
  --color-grass-950: #0b2100;
}

SCSS

$grass: #65ac43;
$grass-rgb: 101, 172, 67;
$grass-light: mix(#fff, $grass, 20%);
$grass-dark: mix(#000, $grass, 20%);

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