#B2621C

CSS

:root {
  --light-brown: #b2621c;
  --light-brown-rgb: 178 98 28;
  --light-brown-oklch: oklch(0.578 0.129 56);
}

.element {
  color: var(--light-brown);
  background-color: hsl(28 73% 40%);
  border-color: oklch(0.578 0.129 56);
}

Tailwind CSS v4

@theme {
  --color-light-brown: #b2621c;
  --color-light-brown-50: #ffedd1;
  --color-light-brown-100: #ffdebe;
  --color-light-brown-200: #ffc79e;
  --color-light-brown-300: #e9a773;
  --color-light-brown-400: #d8894d;
  --color-light-brown-500: #c56b1a;
  --color-light-brown-600: #a65b1a;
  --color-light-brown-700: #864915;
  --color-light-brown-800: #64340f;
  --color-light-brown-900: #462309;
  --color-light-brown-950: #2d1200;
}

SCSS

$light-brown: #b2621c;
$light-brown-rgb: 178, 98, 28;
$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);
}