#999F6D

CSS

:root {
  --willow-leaf: #999f6d;
  --willow-leaf-rgb: 153 159 109;
  --willow-leaf-oklch: oklch(0.685 0.069 113.8);
}

.element {
  color: var(--willow-leaf);
  background-color: hsl(67 21% 53%);
  border-color: oklch(0.685 0.069 113.8);
}

Tailwind CSS v4

@theme {
  --color-willow-leaf: #999f6d;
  --color-willow-leaf-50: #f4f8e2;
  --color-willow-leaf-100: #e6ebd1;
  --color-willow-leaf-200: #d2d8b7;
  --color-willow-leaf-300: #b5bc94;
  --color-willow-leaf-400: #9ea374;
  --color-willow-leaf-500: #858c55;
  --color-willow-leaf-600: #717648;
  --color-willow-leaf-700: #5a5e3a;
  --color-willow-leaf-800: #434528;
  --color-willow-leaf-900: #2e301b;
  --color-willow-leaf-950: #1b1c0b;
}

SCSS

$willow-leaf: #999f6d;
$willow-leaf-rgb: 153, 159, 109;
$willow-leaf-light: mix(#fff, $willow-leaf, 20%);
$willow-leaf-dark: mix(#000, $willow-leaf, 20%);

.element {
  color: $willow-leaf;
  box-shadow: 0 0 0 2px rgba($willow-leaf, 0.35);
}