#AC621B

CSS

:root {
  --light-brown: #ac621b;
  --light-brown-rgb: 172 98 27;
  --light-brown-oklch: oklch(0.569 0.124 58.5);
}

.element {
  color: var(--light-brown);
  background-color: hsl(29 73% 39%);
  border-color: oklch(0.569 0.124 58.5);
}

Tailwind CSS v4

@theme {
  --color-light-brown: #ac621b;
  --color-light-brown-50: #ffeed2;
  --color-light-brown-100: #ffdfbf;
  --color-light-brown-200: #fcc89e;
  --color-light-brown-300: #e6a875;
  --color-light-brown-400: #d58b4f;
  --color-light-brown-500: #c16e1d;
  --color-light-brown-600: #a35e1c;
  --color-light-brown-700: #834b17;
  --color-light-brown-800: #623510;
  --color-light-brown-900: #45250a;
  --color-light-brown-950: #2c1300;
}

SCSS

$light-brown: #ac621b;
$light-brown-rgb: 172, 98, 27;
$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);
}