#63AC43

CSS

:root {
  --grass: #63ac43;
  --grass-rgb: 99 172 67;
  --grass-oklch: oklch(0.674 0.158 137.4);
}

.element {
  color: var(--grass);
  background-color: hsl(102 44% 47%);
  border-color: oklch(0.674 0.158 137.4);
}

Tailwind CSS v4

@theme {
  --color-grass: #63ac43;
  --color-grass-50: #deffd6;
  --color-grass-100: #cdf5c3;
  --color-grass-200: #b1e5a4;
  --color-grass-300: #8ccb7c;
  --color-grass-400: #6eb351;
  --color-grass-500: #4c9d20;
  --color-grass-600: #41851f;
  --color-grass-700: #346a18;
  --color-grass-800: #274e0b;
  --color-grass-900: #1a3607;
  --color-grass-950: #0b2100;
}

SCSS

$grass: #63ac43;
$grass-rgb: 99, 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);
}