#6E4000

CSS

:root {
  --brown: #6e4000;
  --brown-rgb: 110 64 0;
  --brown-oklch: oklch(0.418 0.093 65.7);
}

.element {
  color: var(--brown);
  background-color: hsl(35 100% 22%);
  border-color: oklch(0.418 0.093 65.7);
}

Tailwind CSS v4

@theme {
  --color-brown: #6e4000;
  --color-brown-50: #fff1d9;
  --color-brown-100: #fee3c7;
  --color-brown-200: #f0cdaa;
  --color-brown-300: #d8af84;
  --color-brown-400: #c49362;
  --color-brown-500: #b0793d;
  --color-brown-600: #956635;
  --color-brown-700: #77522a;
  --color-brown-800: #593b1e;
  --color-brown-900: #3e2813;
  --color-brown-950: #271605;
}

SCSS

$brown: #6e4000;
$brown-rgb: 110, 64, 0;
$brown-light: mix(#fff, $brown, 20%);
$brown-dark: mix(#000, $brown, 20%);

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