Black Walnut

CSS

:root {
  --black-walnut: #5e4f46;
  --black-walnut-rgb: 94 79 70;
  --black-walnut-oklch: oklch(0.44 0.025 52.8);
}

.element {
  color: var(--black-walnut);
  background-color: hsl(22 15% 32%);
  border-color: oklch(0.44 0.025 52.8);
}

Tailwind CSS v4

@theme {
  --color-black-walnut: #5e4f46;
  --color-black-walnut-50: #fbf3ef;
  --color-black-walnut-100: #efe6e0;
  --color-black-walnut-200: #ddd2ca;
  --color-black-walnut-300: #c2b4ac;
  --color-black-walnut-400: #ab9b91;
  --color-black-walnut-500: #948277;
  --color-black-walnut-600: #7d6e65;
  --color-black-walnut-700: #645851;
  --color-black-walnut-800: #4a403b;
  --color-black-walnut-900: #332c28;
  --color-black-walnut-950: #1f1916;
}

SCSS

$black-walnut: #5e4f46;
$black-walnut-rgb: 94, 79, 70;
$black-walnut-light: mix(#fff, $black-walnut, 20%);
$black-walnut-dark: mix(#000, $black-walnut, 20%);

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