#1A4329

CSS

:root {
  --zucchini: #1a4329;
  --zucchini-rgb: 26 67 41;
  --zucchini-oklch: oklch(0.345 0.065 153.4);
}

.element {
  color: var(--zucchini);
  background-color: hsl(142 44% 18%);
  border-color: oklch(0.345 0.065 153.4);
}

Tailwind CSS v4

@theme {
  --color-zucchini: #1a4329;
  --color-zucchini-50: #e7fbed;
  --color-zucchini-100: #d8efdf;
  --color-zucchini-200: #bfddc9;
  --color-zucchini-300: #9ec2a9;
  --color-zucchini-400: #81aa8d;
  --color-zucchini-500: #649372;
  --color-zucchini-600: #557c61;
  --color-zucchini-700: #44644d;
  --color-zucchini-800: #314937;
  --color-zucchini-900: #223326;
  --color-zucchini-950: #111e14;
}

SCSS

$zucchini: #1a4329;
$zucchini-rgb: 26, 67, 41;
$zucchini-light: mix(#fff, $zucchini, 20%);
$zucchini-dark: mix(#000, $zucchini, 20%);

.element {
  color: $zucchini;
  box-shadow: 0 0 0 2px rgba($zucchini, 0.35);
}