#374000

CSS

:root {
  --dark-olive: #374000;
  --dark-olive-rgb: 55 64 0;
  --dark-olive-oklch: oklch(0.351 0.082 118.3);
}

.element {
  color: var(--dark-olive);
  background-color: hsl(68 100% 13%);
  border-color: oklch(0.351 0.082 118.3);
}

Tailwind CSS v4

@theme {
  --color-dark-olive: #374000;
  --color-dark-olive-50: #f2f9df;
  --color-dark-olive-100: #e4ecce;
  --color-dark-olive-200: #cfdab3;
  --color-dark-olive-300: #b1be8f;
  --color-dark-olive-400: #99a56e;
  --color-dark-olive-500: #818e4d;
  --color-dark-olive-600: #6d7842;
  --color-dark-olive-700: #576034;
  --color-dark-olive-800: #414624;
  --color-dark-olive-900: #2d3018;
  --color-dark-olive-950: #1a1d09;
}

SCSS

$dark-olive: #374000;
$dark-olive-rgb: 55, 64, 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);
}