#837D00

CSS

:root {
  --olive: #837d00;
  --olive-rgb: 131 125 0;
  --olive-oklch: oklch(0.576 0.123 106.3);
}

.element {
  color: var(--olive);
  background-color: hsl(57 100% 26%);
  border-color: oklch(0.576 0.123 106.3);
}

Tailwind CSS v4

@theme {
  --color-olive: #837d00;
  --color-olive-50: #f8f9d0;
  --color-olive-100: #ebecbc;
  --color-olive-200: #d8d99b;
  --color-olive-300: #bdbd70;
  --color-olive-400: #a8a344;
  --color-olive-500: #918a00;
  --color-olive-600: #7b7502;
  --color-olive-700: #625e05;
  --color-olive-800: #494401;
  --color-olive-900: #332f02;
  --color-olive-950: #1f1b00;
}

SCSS

$olive: #837d00;
$olive-rgb: 131, 125, 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);
}