#7A7900

CSS

:root {
  --olive: #7a7900;
  --olive-rgb: 122 121 0;
  --olive-oklch: oklch(0.559 0.121 109.2);
}

.element {
  color: var(--olive);
  background-color: hsl(60 100% 24%);
  border-color: oklch(0.559 0.121 109.2);
}

Tailwind CSS v4

@theme {
  --color-olive: #7a7900;
  --color-olive-50: #f6f9d2;
  --color-olive-100: #e9ecbe;
  --color-olive-200: #d6da9e;
  --color-olive-300: #b9be73;
  --color-olive-400: #a4a448;
  --color-olive-500: #8d8c05;
  --color-olive-600: #77760e;
  --color-olive-700: #5f5f0c;
  --color-olive-800: #474504;
  --color-olive-900: #313004;
  --color-olive-950: #1d1c00;
}

SCSS

$olive: #7a7900;
$olive-rgb: 122, 121, 0;
$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);
}