#818200

CSS

:root {
  --olive: #818200;
  --olive-rgb: 129 130 0;
  --olive-oklch: oklch(0.586 0.128 110.3);
}

.element {
  color: var(--olive);
  background-color: hsl(60 100% 25%);
  border-color: oklch(0.586 0.128 110.3);
}

Tailwind CSS v4

@theme {
  --color-olive: #818200;
  --color-olive-50: #f5fad0;
  --color-olive-100: #e8edbc;
  --color-olive-200: #d5da9b;
  --color-olive-300: #b8be6f;
  --color-olive-400: #a3a542;
  --color-olive-500: #8c8d00;
  --color-olive-600: #767700;
  --color-olive-700: #5e5f01;
  --color-olive-800: #474500;
  --color-olive-900: #313001;
  --color-olive-950: #1d1c00;
}

SCSS

$olive: #818200;
$olive-rgb: 129, 130, 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);
}