#836909

CSS

:root {
  --muddy-brown: #836909;
  --muddy-brown-rgb: 131 105 9;
  --muddy-brown-oklch: oklch(0.531 0.106 91.1);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(47 87% 27%);
  border-color: oklch(0.531 0.106 91.1);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #836909;
  --color-muddy-brown-50: #fff5d4;
  --color-muddy-brown-100: #f4e8c0;
  --color-muddy-brown-200: #e4d4a1;
  --color-muddy-brown-300: #cab778;
  --color-muddy-brown-400: #b69c50;
  --color-muddy-brown-500: #a08320;
  --color-muddy-brown-600: #876f1e;
  --color-muddy-brown-700: #6d5918;
  --color-muddy-brown-800: #51400f;
  --color-muddy-brown-900: #382c09;
  --color-muddy-brown-950: #231900;
}

SCSS

$muddy-brown: #836909;
$muddy-brown-rgb: 131, 105, 9;
$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);
}