#AE641D

CSS

:root {
  --light-brown: #ae641d;
  --light-brown-rgb: 174 100 29;
  --light-brown-oklch: oklch(0.576 0.124 58.7);
}

.element {
  color: var(--light-brown);
  background-color: hsl(29 71% 40%);
  border-color: oklch(0.576 0.124 58.7);
}

Tailwind CSS v4

@theme {
  --color-light-brown: #ae641d;
  --color-light-brown-50: #ffeed2;
  --color-light-brown-100: #ffdfbf;
  --color-light-brown-200: #fcc99e;
  --color-light-brown-300: #e6a974;
  --color-light-brown-400: #d58b4e;
  --color-light-brown-500: #c16e1c;
  --color-light-brown-600: #a35e1c;
  --color-light-brown-700: #834b16;
  --color-light-brown-800: #62350f;
  --color-light-brown-900: #452509;
  --color-light-brown-950: #2c1300;
}

SCSS

$light-brown: #ae641d;
$light-brown-rgb: 174, 100, 29;
$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);
}