#AB6626

CSS

:root {
  --light-brown: #ab6626;
  --light-brown-rgb: 171 102 38;
  --light-brown-oklch: oklch(0.576 0.117 59.3);
}

.element {
  color: var(--light-brown);
  background-color: hsl(29 64% 41%);
  border-color: oklch(0.576 0.117 59.3);
}

Tailwind CSS v4

@theme {
  --color-light-brown: #ab6626;
  --color-light-brown-50: #ffeed4;
  --color-light-brown-100: #ffe0c1;
  --color-light-brown-200: #fac9a1;
  --color-light-brown-300: #e3aa79;
  --color-light-brown-400: #d18d54;
  --color-light-brown-500: #be7127;
  --color-light-brown-600: #a06024;
  --color-light-brown-700: #814c1c;
  --color-light-brown-800: #603714;
  --color-light-brown-900: #43250c;
  --color-light-brown-950: #2b1402;
}

SCSS

$light-brown: #ab6626;
$light-brown-rgb: 171, 102, 38;
$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);
}