#816A09

CSS

:root {
  --muddy-brown: #816a09;
  --muddy-brown-rgb: 129 106 9;
  --muddy-brown-oklch: oklch(0.531 0.106 93.4);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(49 87% 27%);
  border-color: oklch(0.531 0.106 93.4);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #816a09;
  --color-muddy-brown-50: #fef6d4;
  --color-muddy-brown-100: #f2e8c1;
  --color-muddy-brown-200: #e2d5a1;
  --color-muddy-brown-300: #c8b778;
  --color-muddy-brown-400: #b49d50;
  --color-muddy-brown-500: #9e8420;
  --color-muddy-brown-600: #85701e;
  --color-muddy-brown-700: #6b5918;
  --color-muddy-brown-800: #50410e;
  --color-muddy-brown-900: #382d09;
  --color-muddy-brown-950: #221900;
}

SCSS

$muddy-brown: #816a09;
$muddy-brown-rgb: 129, 106, 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);
}