#856600

CSS

:root {
  --muddy-brown: #856600;
  --muddy-brown-rgb: 133 102 0;
  --muddy-brown-oklch: oklch(0.527 0.108 87.7);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(46 100% 26%);
  border-color: oklch(0.527 0.108 87.7);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #856600;
  --color-muddy-brown-50: #fff4d3;
  --color-muddy-brown-100: #f6e7c0;
  --color-muddy-brown-200: #e6d3a0;
  --color-muddy-brown-300: #cdb576;
  --color-muddy-brown-400: #b99a4e;
  --color-muddy-brown-500: #a4811b;
  --color-muddy-brown-600: #8b6d1b;
  --color-muddy-brown-700: #6f5716;
  --color-muddy-brown-800: #533f0d;
  --color-muddy-brown-900: #3a2b08;
  --color-muddy-brown-950: #241900;
}

SCSS

$muddy-brown: #856600;
$muddy-brown-rgb: 133, 102, 0;
$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);
}