#2F3600

CSS

:root {
  --dark-olive: #2f3600;
  --dark-olive-rgb: 47 54 0;
  --dark-olive-oklch: oklch(0.315 0.073 117.4);
}

.element {
  color: var(--dark-olive);
  background-color: hsl(68 100% 11%);
  border-color: oklch(0.315 0.073 117.4);
}

Tailwind CSS v4

@theme {
  --color-dark-olive: #2f3600;
  --color-dark-olive-50: #f2f9e2;
  --color-dark-olive-100: #e5ecd1;
  --color-dark-olive-200: #d0d9b7;
  --color-dark-olive-300: #b3bd93;
  --color-dark-olive-400: #9ba573;
  --color-dark-olive-500: #828d54;
  --color-dark-olive-600: #6e7747;
  --color-dark-olive-700: #585f39;
  --color-dark-olive-800: #414628;
  --color-dark-olive-900: #2d301a;
  --color-dark-olive-950: #1a1c0b;
}

SCSS

$dark-olive: #2f3600;
$dark-olive-rgb: 47, 54, 0;
$dark-olive-light: mix(#fff, $dark-olive, 20%);
$dark-olive-dark: mix(#000, $dark-olive, 20%);

.element {
  color: $dark-olive;
  box-shadow: 0 0 0 2px rgba($dark-olive, 0.35);
}