#A49C5C

CSS

:root {
  --formosan-green: #a49c5c;
  --formosan-green-rgb: 164 156 92;
  --formosan-green-oklch: oklch(0.685 0.085 102.1);
}

.element {
  color: var(--formosan-green);
  background-color: hsl(53 28% 50%);
  border-color: oklch(0.685 0.085 102.1);
}

Tailwind CSS v4

@theme {
  --color-formosan-green: #a49c5c;
  --color-formosan-green-50: #f9f7db;
  --color-formosan-green-100: #eceaca;
  --color-formosan-green-200: #dad7ad;
  --color-formosan-green-300: #beba87;
  --color-formosan-green-400: #a8a164;
  --color-formosan-green-500: #918840;
  --color-formosan-green-600: #7b7338;
  --color-formosan-green-700: #625c2c;
  --color-formosan-green-800: #49431e;
  --color-formosan-green-900: #332e14;
  --color-formosan-green-950: #1e1b06;
}

SCSS

$formosan-green: #a49c5c;
$formosan-green-rgb: 164, 156, 92;
$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);
}