#866809

CSS

:root {
  --muddy-brown: #866809;
  --muddy-brown-rgb: 134 104 9;
  --muddy-brown-oklch: oklch(0.533 0.106 88.1);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(46 87% 28%);
  border-color: oklch(0.533 0.106 88.1);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #866809;
  --color-muddy-brown-50: #fff5d3;
  --color-muddy-brown-100: #f6e7c0;
  --color-muddy-brown-200: #e6d3a1;
  --color-muddy-brown-300: #ccb577;
  --color-muddy-brown-400: #b89b50;
  --color-muddy-brown-500: #a3811f;
  --color-muddy-brown-600: #8a6d1d;
  --color-muddy-brown-700: #6f5818;
  --color-muddy-brown-800: #533f0e;
  --color-muddy-brown-900: #3a2c09;
  --color-muddy-brown-950: #241900;
}

SCSS

$muddy-brown: #866809;
$muddy-brown-rgb: 134, 104, 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);
}