#7F761B

CSS

:root {
  --olive: #7f761b;
  --olive-rgb: 127 118 27;
  --olive-oklch: oklch(0.557 0.107 103.5);
}

.element {
  color: var(--olive);
  background-color: hsl(55 65% 30%);
  border-color: oklch(0.557 0.107 103.5);
}

Tailwind CSS v4

@theme {
  --color-olive: #7f761b;
  --color-olive-50: #f9f8d5;
  --color-olive-100: #ecebc2;
  --color-olive-200: #dad8a2;
  --color-olive-300: #bfbb7a;
  --color-olive-400: #a9a152;
  --color-olive-500: #938923;
  --color-olive-600: #7c7421;
  --color-olive-700: #635d1a;
  --color-olive-800: #4a430f;
  --color-olive-900: #332e0a;
  --color-olive-950: #1f1b00;
}

SCSS

$olive: #7f761b;
$olive-rgb: 127, 118, 27;
$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);
}