#86681B

CSS

:root {
  --muddy-brown: #86681b;
  --muddy-brown-rgb: 134 104 27;
  --muddy-brown-oklch: oklch(0.533 0.098 86.1);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(43 66% 32%);
  border-color: oklch(0.533 0.098 86.1);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #86681b;
  --color-muddy-brown-50: #fff4d6;
  --color-muddy-brown-100: #f6e7c3;
  --color-muddy-brown-200: #e6d3a5;
  --color-muddy-brown-300: #ccb57d;
  --color-muddy-brown-400: #b89a57;
  --color-muddy-brown-500: #a3812d;
  --color-muddy-brown-600: #8a6d28;
  --color-muddy-brown-700: #6e5720;
  --color-muddy-brown-800: #523f15;
  --color-muddy-brown-900: #392c0d;
  --color-muddy-brown-950: #241902;
}

SCSS

$muddy-brown: #86681b;
$muddy-brown-rgb: 134, 104, 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);
}