#837513

CSS

:root {
  --olive: #837513;
  --olive-rgb: 131 117 19;
  --olive-oklch: oklch(0.559 0.11 100.4);
}

.element {
  color: var(--olive);
  background-color: hsl(53 75% 29%);
  border-color: oklch(0.559 0.11 100.4);
}

Tailwind CSS v4

@theme {
  --color-olive: #837513;
  --color-olive-50: #fbf7d3;
  --color-olive-100: #eeeac0;
  --color-olive-200: #ddd7a0;
  --color-olive-300: #c2ba77;
  --color-olive-400: #ada04e;
  --color-olive-500: #97871a;
  --color-olive-600: #80731a;
  --color-olive-700: #665c15;
  --color-olive-800: #4c420c;
  --color-olive-900: #352e07;
  --color-olive-950: #201a00;
}

SCSS

$olive: #837513;
$olive-rgb: 131, 117, 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);
}