#55AE42

CSS

:root {
  --grass: #55ae42;
  --grass-rgb: 85 174 66;
  --grass-oklch: oklch(0.672 0.169 140.3);
}

.element {
  color: var(--grass);
  background-color: hsl(109 45% 47%);
  border-color: oklch(0.672 0.169 140.3);
}

Tailwind CSS v4

@theme {
  --color-grass: #55ae42;
  --color-grass-50: #daffd6;
  --color-grass-100: #c8f7c3;
  --color-grass-200: #aae7a4;
  --color-grass-300: #83cd7c;
  --color-grass-400: #62b651;
  --color-grass-500: #399f1f;
  --color-grass-600: #32871e;
  --color-grass-700: #286c18;
  --color-grass-800: #1f4f0a;
  --color-grass-900: #153706;
  --color-grass-950: #062200;
}

SCSS

$grass: #55ae42;
$grass-rgb: 85, 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);
}