#9B9E6B

CSS

:root {
  --willow-leaf: #9b9e6b;
  --willow-leaf-rgb: 155 158 107;
  --willow-leaf-oklch: oklch(0.684 0.07 111);
}

.element {
  color: var(--willow-leaf);
  background-color: hsl(64 21% 52%);
  border-color: oklch(0.684 0.07 111);
}

Tailwind CSS v4

@theme {
  --color-willow-leaf: #9b9e6b;
  --color-willow-leaf-50: #f5f8e1;
  --color-willow-leaf-100: #e7ebd0;
  --color-willow-leaf-200: #d4d8b6;
  --color-willow-leaf-300: #b7bc93;
  --color-willow-leaf-400: #a0a372;
  --color-willow-leaf-500: #888b53;
  --color-willow-leaf-600: #737547;
  --color-willow-leaf-700: #5c5e38;
  --color-willow-leaf-800: #444427;
  --color-willow-leaf-900: #2f2f1a;
  --color-willow-leaf-950: #1c1c0b;
}

SCSS

$willow-leaf: #9b9e6b;
$willow-leaf-rgb: 155, 158, 107;
$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);
}