#787821

CSS

:root {
  --olive: #787821;
  --olive-rgb: 120 120 33;
  --olive-oklch: oklch(0.556 0.107 109.4);
}

.element {
  color: var(--olive);
  background-color: hsl(60 57% 30%);
  border-color: oklch(0.556 0.107 109.4);
}

Tailwind CSS v4

@theme {
  --color-olive: #787821;
  --color-olive-50: #f6f9d6;
  --color-olive-100: #e8ecc3;
  --color-olive-200: #d5d9a5;
  --color-olive-300: #b9bd7d;
  --color-olive-400: #a3a456;
  --color-olive-500: #8b8c2a;
  --color-olive-600: #767626;
  --color-olive-700: #5e5f1e;
  --color-olive-800: #464513;
  --color-olive-900: #31300c;
  --color-olive-950: #1d1c01;
}

SCSS

$olive: #787821;
$olive-rgb: 120, 120, 33;
$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);
}