#837807

CSS

:root {
  --olive: #837807;
  --olive-rgb: 131 120 7;
  --olive-oklch: oklch(0.565 0.117 102.9);
}

.element {
  color: var(--olive);
  background-color: hsl(55 90% 27%);
  border-color: oklch(0.565 0.117 102.9);
}

Tailwind CSS v4

@theme {
  --color-olive: #837807;
  --color-olive-50: #faf8d1;
  --color-olive-100: #edebbe;
  --color-olive-200: #dbd89d;
  --color-olive-300: #c0bb73;
  --color-olive-400: #aba148;
  --color-olive-500: #958808;
  --color-olive-600: #7e740f;
  --color-olive-700: #655c0d;
  --color-olive-800: #4b4305;
  --color-olive-900: #342e04;
  --color-olive-950: #201b00;
}

SCSS

$olive: #837807;
$olive-rgb: 131, 120, 7;
$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);
}