#7A7813

CSS

:root {
  --olive: #7a7813;
  --olive-rgb: 122 120 19;
  --olive-oklch: oklch(0.557 0.114 108.4);
}

.element {
  color: var(--olive);
  background-color: hsl(59 73% 28%);
  border-color: oklch(0.557 0.114 108.4);
}

Tailwind CSS v4

@theme {
  --color-olive: #7a7813;
  --color-olive-50: #f6f9d4;
  --color-olive-100: #e9ecc0;
  --color-olive-200: #d6d9a1;
  --color-olive-300: #babd77;
  --color-olive-400: #a4a44e;
  --color-olive-500: #8d8b1b;
  --color-olive-600: #78761b;
  --color-olive-700: #605e16;
  --color-olive-800: #47450b;
  --color-olive-900: #312f07;
  --color-olive-950: #1e1c00;
}

SCSS

$olive: #7a7813;
$olive-rgb: 122, 120, 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);
}