#777B23

CSS

:root {
  --olive: #777b23;
  --olive-rgb: 119 123 35;
  --olive-oklch: oklch(0.562 0.109 112);
}

.element {
  color: var(--olive);
  background-color: hsl(63 56% 31%);
  border-color: oklch(0.562 0.109 112);
}

Tailwind CSS v4

@theme {
  --color-olive: #777b23;
  --color-olive-50: #f4f9d6;
  --color-olive-100: #e7edc3;
  --color-olive-200: #d3daa5;
  --color-olive-300: #b6be7d;
  --color-olive-400: #a0a556;
  --color-olive-500: #888d2a;
  --color-olive-600: #737726;
  --color-olive-700: #5c5f1e;
  --color-olive-800: #454512;
  --color-olive-900: #30300b;
  --color-olive-950: #1c1c01;
}

SCSS

$olive: #777b23;
$olive-rgb: 119, 123, 35;
$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);
}