#7B7A1F

CSS

:root {
  --olive: #7b7a1f;
  --olive-rgb: 123 122 31;
  --olive-oklch: oklch(0.563 0.109 108.8);
}

.element {
  color: var(--olive);
  background-color: hsl(59 60% 30%);
  border-color: oklch(0.563 0.109 108.8);
}

Tailwind CSS v4

@theme {
  --color-olive: #7b7a1f;
  --color-olive-50: #f6f9d5;
  --color-olive-100: #e9ecc2;
  --color-olive-200: #d6d9a3;
  --color-olive-300: #babd7b;
  --color-olive-400: #a4a453;
  --color-olive-500: #8c8b25;
  --color-olive-600: #777622;
  --color-olive-700: #5f5e1b;
  --color-olive-800: #474510;
  --color-olive-900: #312f0a;
  --color-olive-950: #1d1c00;
}

SCSS

$olive: #7b7a1f;
$olive-rgb: 123, 122, 31;
$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);
}