#79781F

CSS

:root {
  --olive: #79781f;
  --olive-rgb: 121 120 31;
  --olive-oklch: oklch(0.557 0.108 108.8);
}

.element {
  color: var(--olive);
  background-color: hsl(59 59% 30%);
  border-color: oklch(0.557 0.108 108.8);
}

Tailwind CSS v4

@theme {
  --color-olive: #79781f;
  --color-olive-50: #f6f9d6;
  --color-olive-100: #e9ecc3;
  --color-olive-200: #d6d9a4;
  --color-olive-300: #babd7c;
  --color-olive-400: #a4a454;
  --color-olive-500: #8c8b28;
  --color-olive-600: #777624;
  --color-olive-700: #5f5e1d;
  --color-olive-800: #474511;
  --color-olive-900: #312f0b;
  --color-olive-950: #1d1c01;
}

SCSS

$olive: #79781f;
$olive-rgb: 121, 120, 31;
$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);
}