#57AE42

CSS

:root {
  --grass: #57ae42;
  --grass-rgb: 87 174 66;
  --grass-oklch: oklch(0.673 0.168 139.9);
}

.element {
  color: var(--grass);
  background-color: hsl(108 45% 47%);
  border-color: oklch(0.673 0.168 139.9);
}

Tailwind CSS v4

@theme {
  --color-grass: #57ae42;
  --color-grass-50: #dbffd6;
  --color-grass-100: #c9f7c3;
  --color-grass-200: #abe7a4;
  --color-grass-300: #84cd7b;
  --color-grass-400: #64b650;
  --color-grass-500: #3c9f1e;
  --color-grass-600: #34861d;
  --color-grass-700: #2a6c18;
  --color-grass-800: #214f0a;
  --color-grass-900: #163706;
  --color-grass-950: #062200;
}

SCSS

$grass: #57ae42;
$grass-rgb: 87, 174, 66;
$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);
}