#5EAD43

CSS

:root {
  --grass: #5ead43;
  --grass-rgb: 94 173 67;
  --grass-oklch: oklch(0.674 0.162 138.6);
}

.element {
  color: var(--grass);
  background-color: hsl(105 44% 47%);
  border-color: oklch(0.674 0.162 138.6);
}

Tailwind CSS v4

@theme {
  --color-grass: #5ead43;
  --color-grass-50: #ddffd6;
  --color-grass-100: #cbf6c3;
  --color-grass-200: #afe6a4;
  --color-grass-300: #88cc7c;
  --color-grass-400: #6ab451;
  --color-grass-500: #459e20;
  --color-grass-600: #3c851e;
  --color-grass-700: #2f6b18;
  --color-grass-800: #254e0b;
  --color-grass-900: #183607;
  --color-grass-950: #092100;
}

SCSS

$grass: #5ead43;
$grass-rgb: 94, 173, 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);
}