#633500

CSS

:root {
  --brown: #633500;
  --brown-rgb: 99 53 0;
  --brown-oklch: oklch(0.38 0.088 60.9);
}

.element {
  color: var(--brown);
  background-color: hsl(32 100% 19%);
  border-color: oklch(0.38 0.088 60.9);
}

Tailwind CSS v4

@theme {
  --color-brown: #633500;
  --color-brown-50: #fff0dc;
  --color-brown-100: #fee2ca;
  --color-brown-200: #f0cdae;
  --color-brown-300: #d8ae89;
  --color-brown-400: #c59268;
  --color-brown-500: #b17846;
  --color-brown-600: #95663c;
  --color-brown-700: #785130;
  --color-brown-800: #593b22;
  --color-brown-900: #3e2816;
  --color-brown-950: #271608;
}

SCSS

$brown: #633500;
$brown-rgb: 99, 53, 0;
$brown-light: mix(#fff, $brown, 20%);
$brown-dark: mix(#000, $brown, 20%);

.element {
  color: $brown;
  box-shadow: 0 0 0 2px rgba($brown, 0.35);
}