#84691B

CSS

:root {
  --muddy-brown: #84691b;
  --muddy-brown-rgb: 132 105 27;
  --muddy-brown-oklch: oklch(0.533 0.098 88.6);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(45 66% 31%);
  border-color: oklch(0.533 0.098 88.6);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #84691b;
  --color-muddy-brown-50: #fff5d6;
  --color-muddy-brown-100: #f4e7c3;
  --color-muddy-brown-200: #e4d3a5;
  --color-muddy-brown-300: #cab67d;
  --color-muddy-brown-400: #b69b57;
  --color-muddy-brown-500: #a1822d;
  --color-muddy-brown-600: #886e28;
  --color-muddy-brown-700: #6d5820;
  --color-muddy-brown-800: #514015;
  --color-muddy-brown-900: #392c0d;
  --color-muddy-brown-950: #231902;
}

SCSS

$muddy-brown: #84691b;
$muddy-brown-rgb: 132, 105, 27;
$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);
}