#836913

CSS

:root {
  --muddy-brown: #836913;
  --muddy-brown-rgb: 131 105 19;
  --muddy-brown-oklch: oklch(0.532 0.102 90.3);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(46 75% 29%);
  border-color: oklch(0.532 0.102 90.3);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #836913;
  --color-muddy-brown-50: #fff5d5;
  --color-muddy-brown-100: #f4e8c2;
  --color-muddy-brown-200: #e4d4a3;
  --color-muddy-brown-300: #cab67a;
  --color-muddy-brown-400: #b69c54;
  --color-muddy-brown-500: #a08327;
  --color-muddy-brown-600: #876f23;
  --color-muddy-brown-700: #6c581c;
  --color-muddy-brown-800: #514012;
  --color-muddy-brown-900: #382c0b;
  --color-muddy-brown-950: #231901;
}

SCSS

$muddy-brown: #836913;
$muddy-brown-rgb: 131, 105, 19;
$muddy-brown-light: mix(#fff, $muddy-brown, 20%);
$muddy-brown-dark: mix(#000, $muddy-brown, 20%);

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