#B56003

CSS

:root {
  --light-brown: #b56003;
  --light-brown-rgb: 181 96 3;
  --light-brown-oklch: oklch(0.578 0.139 57);
}

.element {
  color: var(--light-brown);
  background-color: hsl(31 97% 36%);
  border-color: oklch(0.578 0.139 57);
}

Tailwind CSS v4

@theme {
  --color-light-brown: #b56003;
  --color-light-brown-50: #ffecce;
  --color-light-brown-100: #ffdeba;
  --color-light-brown-200: #ffc699;
  --color-light-brown-300: #eca66d;
  --color-light-brown-400: #db8744;
  --color-light-brown-500: #c86900;
  --color-light-brown-600: #a95a03;
  --color-light-brown-700: #884706;
  --color-light-brown-800: #663305;
  --color-light-brown-900: #482304;
  --color-light-brown-950: #2e1100;
}

SCSS

$light-brown: #b56003;
$light-brown-rgb: 181, 96, 3;
$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);
}