#797812

CSS

:root {
  --olive: #797812;
  --olive-rgb: 121 120 18;
  --olive-oklch: oklch(0.556 0.115 109);
}

.element {
  color: var(--olive);
  background-color: hsl(59 74% 27%);
  border-color: oklch(0.556 0.115 109);
}

Tailwind CSS v4

@theme {
  --color-olive: #797812;
  --color-olive-50: #f6f9d3;
  --color-olive-100: #e9ecc0;
  --color-olive-200: #d6d9a1;
  --color-olive-300: #b9bd77;
  --color-olive-400: #a4a44e;
  --color-olive-500: #8d8c1b;
  --color-olive-600: #77761a;
  --color-olive-700: #5f5f15;
  --color-olive-800: #47450b;
  --color-olive-900: #313007;
  --color-olive-950: #1d1c00;
}

SCSS

$olive: #797812;
$olive-rgb: 121, 120, 18;
$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);
}