#787913

CSS

:root {
  --olive: #787913;
  --olive-rgb: 120 121 19;
  --olive-oklch: oklch(0.557 0.116 110.2);
}

.element {
  color: var(--olive);
  background-color: hsl(61 73% 27%);
  border-color: oklch(0.557 0.116 110.2);
}

Tailwind CSS v4

@theme {
  --color-olive: #787913;
  --color-olive-50: #f5f9d4;
  --color-olive-100: #e8ecc0;
  --color-olive-200: #d5daa1;
  --color-olive-300: #b8be77;
  --color-olive-400: #a2a44e;
  --color-olive-500: #8b8c1b;
  --color-olive-600: #76771b;
  --color-olive-700: #5e5f15;
  --color-olive-800: #46450b;
  --color-olive-900: #313007;
  --color-olive-950: #1d1c00;
}

SCSS

$olive: #787913;
$olive-rgb: 120, 121, 19;
$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);
}