#A59C59

CSS

:root {
  --formosan-green: #a59c59;
  --formosan-green-rgb: 165 156 89;
  --formosan-green-oklch: oklch(0.685 0.089 101.7);
}

.element {
  color: var(--formosan-green);
  background-color: hsl(53 30% 50%);
  border-color: oklch(0.685 0.089 101.7);
}

Tailwind CSS v4

@theme {
  --color-formosan-green: #a59c59;
  --color-formosan-green-50: #f9f7da;
  --color-formosan-green-100: #eceac8;
  --color-formosan-green-200: #dad7ab;
  --color-formosan-green-300: #bfba85;
  --color-formosan-green-400: #a9a161;
  --color-formosan-green-500: #92883c;
  --color-formosan-green-600: #7c7334;
  --color-formosan-green-700: #635c2a;
  --color-formosan-green-800: #4a431c;
  --color-formosan-green-900: #332e12;
  --color-formosan-green-950: #1f1b05;
}

SCSS

$formosan-green: #a59c59;
$formosan-green-rgb: 165, 156, 89;
$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);
}