#AD9A45

CSS

:root {
  --formosan-green: #ad9a45;
  --formosan-green-rgb: 173 154 69;
  --formosan-green-oklch: oklch(0.686 0.108 96.8);
}

.element {
  color: var(--formosan-green);
  background-color: hsl(49 43% 47%);
  border-color: oklch(0.686 0.108 96.8);
}

Tailwind CSS v4

@theme {
  --color-formosan-green: #ad9a45;
  --color-formosan-green-50: #fdf6d3;
  --color-formosan-green-100: #f1e9c0;
  --color-formosan-green-200: #dfd6a1;
  --color-formosan-green-300: #c5b977;
  --color-formosan-green-400: #b09f4f;
  --color-formosan-green-500: #9b861e;
  --color-formosan-green-600: #83711d;
  --color-formosan-green-700: #695a17;
  --color-formosan-green-800: #4e420d;
  --color-formosan-green-900: #362d08;
  --color-formosan-green-950: #211a00;
}

SCSS

$formosan-green: #ad9a45;
$formosan-green-rgb: 173, 154, 69;
$formosan-green-light: mix(#fff, $formosan-green, 20%);
$formosan-green-dark: mix(#000, $formosan-green, 20%);

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