#56AE3F

CSS

:root {
  --grass: #56ae3f;
  --grass-rgb: 86 174 63;
  --grass-oklch: oklch(0.672 0.171 139.7);
}

.element {
  color: var(--grass);
  background-color: hsl(108 47% 46%);
  border-color: oklch(0.672 0.171 139.7);
}

Tailwind CSS v4

@theme {
  --color-grass: #56ae3f;
  --color-grass-50: #dbffd5;
  --color-grass-100: #c8f7c2;
  --color-grass-200: #abe7a3;
  --color-grass-300: #83cd7a;
  --color-grass-400: #63b64e;
  --color-grass-500: #3b9f19;
  --color-grass-600: #338719;
  --color-grass-700: #296c15;
  --color-grass-800: #204f07;
  --color-grass-900: #153705;
  --color-grass-950: #062200;
}

SCSS

$grass: #56ae3f;
$grass-rgb: 86, 174, 63;
$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);
}