#84771A

CSS

:root {
  --olive: #84771a;
  --olive-rgb: 132 119 26;
  --olive-oklch: oklch(0.565 0.109 100.9);
}

.element {
  color: var(--olive);
  background-color: hsl(53 67% 31%);
  border-color: oklch(0.565 0.109 100.9);
}

Tailwind CSS v4

@theme {
  --color-olive: #84771a;
  --color-olive-50: #faf7d4;
  --color-olive-100: #eeeac1;
  --color-olive-200: #dcd7a1;
  --color-olive-300: #c1ba78;
  --color-olive-400: #aca050;
  --color-olive-500: #96881f;
  --color-olive-600: #7f731d;
  --color-olive-700: #665c17;
  --color-olive-800: #4c430e;
  --color-olive-900: #352e08;
  --color-olive-950: #201b00;
}

SCSS

$olive: #84771a;
$olive-rgb: 132, 119, 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);
}