#84690C

CSS

:root {
  --muddy-brown: #84690c;
  --muddy-brown-rgb: 132 105 12;
  --muddy-brown-oklch: oklch(0.533 0.105 90.2);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(46 83% 28%);
  border-color: oklch(0.533 0.105 90.2);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #84690c;
  --color-muddy-brown-50: #fff5d4;
  --color-muddy-brown-100: #f4e8c1;
  --color-muddy-brown-200: #e4d4a1;
  --color-muddy-brown-300: #cab678;
  --color-muddy-brown-400: #b69c51;
  --color-muddy-brown-500: #a18221;
  --color-muddy-brown-600: #886e1f;
  --color-muddy-brown-700: #6d5819;
  --color-muddy-brown-800: #51400f;
  --color-muddy-brown-900: #392c09;
  --color-muddy-brown-950: #231900;
}

SCSS

$muddy-brown: #84690c;
$muddy-brown-rgb: 132, 105, 12;
$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);
}