#AD6525

CSS

:root {
  --light-brown: #ad6525;
  --light-brown-rgb: 173 101 37;
  --light-brown-oklch: oklch(0.577 0.12 57.9);
}

.element {
  color: var(--light-brown);
  background-color: hsl(28 65% 41%);
  border-color: oklch(0.577 0.12 57.9);
}

Tailwind CSS v4

@theme {
  --color-light-brown: #ad6525;
  --color-light-brown-50: #ffeed4;
  --color-light-brown-100: #ffdfc0;
  --color-light-brown-200: #fbc9a1;
  --color-light-brown-300: #e5a978;
  --color-light-brown-400: #d38c53;
  --color-light-brown-500: #c06f26;
  --color-light-brown-600: #a25e23;
  --color-light-brown-700: #824b1b;
  --color-light-brown-800: #613613;
  --color-light-brown-900: #44250c;
  --color-light-brown-950: #2c1301;
}

SCSS

$light-brown: #ad6525;
$light-brown-rgb: 173, 101, 37;
$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);
}