#818426

CSS

:root {
  --olive: #818426;
  --olive-rgb: 129 132 38;
  --olive-oklch: oklch(0.593 0.114 111.2);
}

.element {
  color: var(--olive);
  background-color: hsl(62 55% 33%);
  border-color: oklch(0.593 0.114 111.2);
}

Tailwind CSS v4

@theme {
  --color-olive: #818426;
  --color-olive-50: #f5f9d4;
  --color-olive-100: #e7edc1;
  --color-olive-200: #d4daa2;
  --color-olive-300: #b7be79;
  --color-olive-400: #a1a550;
  --color-olive-500: #8a8d1f;
  --color-olive-600: #74771e;
  --color-olive-700: #5d5f18;
  --color-olive-800: #46450d;
  --color-olive-900: #303008;
  --color-olive-950: #1c1c00;
}

SCSS

$olive: #818426;
$olive-rgb: 129, 132, 38;
$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);
}