#64AC32

CSS

:root {
  --grass: #64ac32;
  --grass-rgb: 100 172 50;
  --grass-oklch: oklch(0.673 0.17 135.2);
}

.element {
  color: var(--grass);
  background-color: hsl(95 55% 44%);
  border-color: oklch(0.673 0.17 135.2);
}

Tailwind CSS v4

@theme {
  --color-grass: #64ac32;
  --color-grass-50: #dfffd2;
  --color-grass-100: #cdf6be;
  --color-grass-200: #b2e69d;
  --color-grass-300: #8ccc73;
  --color-grass-400: #6fb444;
  --color-grass-500: #4d9d00;
  --color-grass-600: #428500;
  --color-grass-700: #356a03;
  --color-grass-800: #294e00;
  --color-grass-900: #1b3600;
  --color-grass-950: #0b2100;
}

SCSS

$grass: #64ac32;
$grass-rgb: 100, 172, 50;
$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);
}