#768000

CSS

:root {
  --olive: #768000;
  --olive-rgb: 118 128 0;
  --olive-oklch: oklch(0.572 0.13 115.1);
}

.element {
  color: var(--olive);
  background-color: hsl(65 100% 25%);
  border-color: oklch(0.572 0.13 115.1);
}

Tailwind CSS v4

@theme {
  --color-olive: #768000;
  --color-olive-50: #f2fbd1;
  --color-olive-100: #e4eebd;
  --color-olive-200: #d0dc9c;
  --color-olive-300: #b2c072;
  --color-olive-400: #9ca745;
  --color-olive-500: #848f00;
  --color-olive-600: #707905;
  --color-olive-700: #596107;
  --color-olive-800: #434701;
  --color-olive-900: #2e3102;
  --color-olive-950: #1b1d00;
}

SCSS

$olive: #768000;
$olive-rgb: 118, 128, 0;
$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);
}