#B16218

CSS

:root {
  --light-brown: #b16218;
  --light-brown-rgb: 177 98 24;
  --light-brown-oklch: oklch(0.576 0.13 57.1);
}

.element {
  color: var(--light-brown);
  background-color: hsl(29 76% 39%);
  border-color: oklch(0.576 0.13 57.1);
}

Tailwind CSS v4

@theme {
  --color-light-brown: #b16218;
  --color-light-brown-50: #ffedd1;
  --color-light-brown-100: #ffdebd;
  --color-light-brown-200: #ffc79d;
  --color-light-brown-300: #e9a772;
  --color-light-brown-400: #d8894b;
  --color-light-brown-500: #c56c16;
  --color-light-brown-600: #a65c17;
  --color-light-brown-700: #854913;
  --color-light-brown-800: #64340d;
  --color-light-brown-900: #462408;
  --color-light-brown-950: #2d1200;
}

SCSS

$light-brown: #b16218;
$light-brown-rgb: 177, 98, 24;
$light-brown-light: mix(#fff, $light-brown, 20%);
$light-brown-dark: mix(#000, $light-brown, 20%);

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