#AD6217

CSS

:root {
  --light-brown: #ad6217;
  --light-brown-rgb: 173 98 23;
  --light-brown-oklch: oklch(0.571 0.127 58.9);
}

.element {
  color: var(--light-brown);
  background-color: hsl(30 77% 38%);
  border-color: oklch(0.571 0.127 58.9);
}

Tailwind CSS v4

@theme {
  --color-light-brown: #ad6217;
  --color-light-brown-50: #ffeed1;
  --color-light-brown-100: #ffdfbe;
  --color-light-brown-200: #fdc89d;
  --color-light-brown-300: #e7a873;
  --color-light-brown-400: #d58b4c;
  --color-light-brown-500: #c26e18;
  --color-light-brown-600: #a45d18;
  --color-light-brown-700: #844b14;
  --color-light-brown-800: #62350e;
  --color-light-brown-900: #452408;
  --color-light-brown-950: #2d1300;
}

SCSS

$light-brown: #ad6217;
$light-brown-rgb: 173, 98, 23;
$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);
}