#645B3E

CSS

:root {
  --olive-bark: #645b3e;
  --olive-bark-rgb: 100 91 62;
  --olive-bark-oklch: oklch(0.472 0.045 92.9);
}

.element {
  color: var(--olive-bark);
  background-color: hsl(46 23% 32%);
  border-color: oklch(0.472 0.045 92.9);
}

Tailwind CSS v4

@theme {
  --color-olive-bark: #645b3e;
  --color-olive-bark-50: #f9f5e7;
  --color-olive-bark-100: #ece8d8;
  --color-olive-bark-200: #dad4bf;
  --color-olive-bark-300: #beb89e;
  --color-olive-bark-400: #a79e81;
  --color-olive-bark-500: #908664;
  --color-olive-bark-600: #7a7155;
  --color-olive-bark-700: #625b44;
  --color-olive-bark-800: #484231;
  --color-olive-bark-900: #322e21;
  --color-olive-bark-950: #1e1a10;
}

SCSS

$olive-bark: #645b3e;
$olive-bark-rgb: 100, 91, 62;
$olive-bark-light: mix(#fff, $olive-bark, 20%);
$olive-bark-dark: mix(#000, $olive-bark, 20%);

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