#89790D

CSS

:root {
  --olive: #89790d;
  --olive-rgb: 137 121 13;
  --olive-oklch: oklch(0.574 0.116 99.7);
}

.element {
  color: var(--olive);
  background-color: hsl(52 83% 29%);
  border-color: oklch(0.574 0.116 99.7);
}

Tailwind CSS v4

@theme {
  --color-olive: #89790d;
  --color-olive-50: #fbf7d1;
  --color-olive-100: #efeabe;
  --color-olive-200: #ded79d;
  --color-olive-300: #c3ba73;
  --color-olive-400: #afa048;
  --color-olive-500: #998707;
  --color-olive-600: #81720f;
  --color-olive-700: #675b0d;
  --color-olive-800: #4d4206;
  --color-olive-900: #362e04;
  --color-olive-950: #211a00;
}

SCSS

$olive: #89790d;
$olive-rgb: 137, 121, 13;
$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);
}