#8C8A00

CSS

:root {
  --olive: #8c8a00;
  --olive-rgb: 140 138 0;
  --olive-oklch: oklch(0.615 0.133 108.7);
}

.element {
  color: var(--olive);
  background-color: hsl(59 100% 27%);
  border-color: oklch(0.615 0.133 108.7);
}

Tailwind CSS v4

@theme {
  --color-olive: #8c8a00;
  --color-olive-50: #f6f9ce;
  --color-olive-100: #e9edba;
  --color-olive-200: #d6da97;
  --color-olive-300: #babe6b;
  --color-olive-400: #a5a43b;
  --color-olive-500: #8e8c00;
  --color-olive-600: #787600;
  --color-olive-700: #605f00;
  --color-olive-800: #484500;
  --color-olive-900: #323000;
  --color-olive-950: #1e1c00;
}

SCSS

$olive: #8c8a00;
$olive-rgb: 140, 138, 0;
$olive-light: mix(#fff, $olive, 20%);
$olive-dark: mix(#000, $olive, 20%);

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