#898000

CSS

:root {
  --olive: #898000;
  --olive-rgb: 137 128 0;
  --olive-oklch: oklch(0.589 0.125 104.7);
}

.element {
  color: var(--olive);
  background-color: hsl(56 100% 27%);
  border-color: oklch(0.589 0.125 104.7);
}

Tailwind CSS v4

@theme {
  --color-olive: #898000;
  --color-olive-50: #f9f8cf;
  --color-olive-100: #ecebbb;
  --color-olive-200: #dad89a;
  --color-olive-300: #bfbc6e;
  --color-olive-400: #aaa241;
  --color-olive-500: #948900;
  --color-olive-600: #7d7400;
  --color-olive-700: #645d00;
  --color-olive-800: #4b4300;
  --color-olive-900: #342f01;
  --color-olive-950: #1f1b00;
}

SCSS

$olive: #898000;
$olive-rgb: 137, 128, 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);
}