#7C7A21

CSS

:root {
  --olive: #7c7a21;
  --olive-rgb: 124 122 33;
  --olive-oklch: oklch(0.564 0.108 108.1);
}

.element {
  color: var(--olive);
  background-color: hsl(59 58% 31%);
  border-color: oklch(0.564 0.108 108.1);
}

Tailwind CSS v4

@theme {
  --color-olive: #7c7a21;
  --color-olive-50: #f6f9d5;
  --color-olive-100: #e9ecc3;
  --color-olive-200: #d6d9a4;
  --color-olive-300: #babd7b;
  --color-olive-400: #a4a354;
  --color-olive-500: #8d8b27;
  --color-olive-600: #777623;
  --color-olive-700: #605e1c;
  --color-olive-800: #474411;
  --color-olive-900: #312f0b;
  --color-olive-950: #1d1c01;
}

SCSS

$olive: #7c7a21;
$olive-rgb: 124, 122, 33;
$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);
}