#86681D

CSS

:root {
  --muddy-brown: #86681d;
  --muddy-brown-rgb: 134 104 29;
  --muddy-brown-oklch: oklch(0.534 0.097 85.8);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(43 64% 32%);
  border-color: oklch(0.534 0.097 85.8);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #86681d;
  --color-muddy-brown-50: #fff4d6;
  --color-muddy-brown-100: #f6e7c4;
  --color-muddy-brown-200: #e6d3a5;
  --color-muddy-brown-300: #ccb57d;
  --color-muddy-brown-400: #b89a58;
  --color-muddy-brown-500: #a3812f;
  --color-muddy-brown-600: #8a6d29;
  --color-muddy-brown-700: #6e5721;
  --color-muddy-brown-800: #523f16;
  --color-muddy-brown-900: #392b0e;
  --color-muddy-brown-950: #241902;
}

SCSS

$muddy-brown: #86681d;
$muddy-brown-rgb: 134, 104, 29;
$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);
}