#63913C

CSS

:root {
  --bitter-leaf: #63913c;
  --bitter-leaf-rgb: 99 145 60;
  --bitter-leaf-oklch: oklch(0.604 0.126 132.8);
}

.element {
  color: var(--bitter-leaf);
  background-color: hsl(92 41% 40%);
  border-color: oklch(0.604 0.126 132.8);
}

Tailwind CSS v4

@theme {
  --color-bitter-leaf: #63913c;
  --color-bitter-leaf-50: #e6feda;
  --color-bitter-leaf-100: #d6f2c8;
  --color-bitter-leaf-200: #bee1aa;
  --color-bitter-leaf-300: #9cc684;
  --color-bitter-leaf-400: #81ae5e;
  --color-bitter-leaf-500: #649737;
  --color-bitter-leaf-600: #558030;
  --color-bitter-leaf-700: #446626;
  --color-bitter-leaf-800: #334b18;
  --color-bitter-leaf-900: #22340f;
  --color-bitter-leaf-950: #121f03;
}

SCSS

$bitter-leaf: #63913c;
$bitter-leaf-rgb: 99, 145, 60;
$bitter-leaf-light: mix(#fff, $bitter-leaf, 20%);
$bitter-leaf-dark: mix(#000, $bitter-leaf, 20%);

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