#6F3E04

CSS

:root {
  --brown: #6f3e04;
  --brown-rgb: 111 62 4;
  --brown-oklch: oklch(0.415 0.093 61.8);
}

.element {
  color: var(--brown);
  background-color: hsl(33 93% 23%);
  border-color: oklch(0.415 0.093 61.8);
}

Tailwind CSS v4

@theme {
  --color-brown: #6f3e04;
  --color-brown-50: #fff0da;
  --color-brown-100: #ffe2c8;
  --color-brown-200: #f1ccab;
  --color-brown-300: #daae85;
  --color-brown-400: #c79264;
  --color-brown-500: #b27740;
  --color-brown-600: #976537;
  --color-brown-700: #79512c;
  --color-brown-800: #5a3a1f;
  --color-brown-900: #3f2814;
  --color-brown-950: #281606;
}

SCSS

$brown: #6f3e04;
$brown-rgb: 111, 62, 4;
$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);
}