#7B7500

CSS

:root {
  --olive: #7b7500;
  --olive-rgb: 123 117 0;
  --olive-oklch: oklch(0.55 0.117 106.1);
}

.element {
  color: var(--olive);
  background-color: hsl(57 100% 24%);
  border-color: oklch(0.55 0.117 106.1);
}

Tailwind CSS v4

@theme {
  --color-olive: #7b7500;
  --color-olive-50: #f8f8d2;
  --color-olive-100: #ebecbf;
  --color-olive-200: #d8d99e;
  --color-olive-300: #bdbc74;
  --color-olive-400: #a7a34a;
  --color-olive-500: #918a0d;
  --color-olive-600: #7a7512;
  --color-olive-700: #625e0f;
  --color-olive-800: #494407;
  --color-olive-900: #332f05;
  --color-olive-950: #1f1b00;
}

SCSS

$olive: #7b7500;
$olive-rgb: 123, 117, 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);
}