#75791A

CSS

:root {
  --olive: #75791a;
  --olive-rgb: 117 121 26;
  --olive-oklch: oklch(0.555 0.113 112);
}

.element {
  color: var(--olive);
  background-color: hsl(63 65% 29%);
  border-color: oklch(0.555 0.113 112);
}

Tailwind CSS v4

@theme {
  --color-olive: #75791a;
  --color-olive-50: #f4f9d5;
  --color-olive-100: #e7edc2;
  --color-olive-200: #d3daa3;
  --color-olive-300: #b6be7a;
  --color-olive-400: #a0a552;
  --color-olive-500: #888d23;
  --color-olive-600: #737721;
  --color-olive-700: #5c5f1a;
  --color-olive-800: #45450f;
  --color-olive-900: #303009;
  --color-olive-950: #1c1c00;
}

SCSS

$olive: #75791a;
$olive-rgb: 117, 121, 26;
$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);
}