#80781B

CSS

:root {
  --olive: #80781b;
  --olive-rgb: 128 120 27;
  --olive-oklch: oklch(0.563 0.109 104.3);
}

.element {
  color: var(--olive);
  background-color: hsl(55 65% 30%);
  border-color: oklch(0.563 0.109 104.3);
}

Tailwind CSS v4

@theme {
  --color-olive: #80781b;
  --color-olive-50: #f9f8d4;
  --color-olive-100: #ecebc1;
  --color-olive-200: #dad8a2;
  --color-olive-300: #bebb79;
  --color-olive-400: #a9a251;
  --color-olive-500: #928920;
  --color-olive-600: #7c741f;
  --color-olive-700: #635d18;
  --color-olive-800: #4a430e;
  --color-olive-900: #332f09;
  --color-olive-950: #1f1b00;
}

SCSS

$olive: #80781b;
$olive-rgb: 128, 120, 27;
$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);
}