#816A1D

CSS

:root {
  --muddy-brown: #816a1d;
  --muddy-brown-rgb: 129 106 29;
  --muddy-brown-oklch: oklch(0.532 0.097 91.6);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(46 63% 31%);
  border-color: oklch(0.532 0.097 91.6);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #816a1d;
  --color-muddy-brown-50: #fef5d7;
  --color-muddy-brown-100: #f2e8c4;
  --color-muddy-brown-200: #e2d4a6;
  --color-muddy-brown-300: #c8b77e;
  --color-muddy-brown-400: #b39d58;
  --color-muddy-brown-500: #9e842f;
  --color-muddy-brown-600: #856f2a;
  --color-muddy-brown-700: #6b5921;
  --color-muddy-brown-800: #504116;
  --color-muddy-brown-900: #372c0e;
  --color-muddy-brown-950: #221902;
}

SCSS

$muddy-brown: #816a1d;
$muddy-brown-rgb: 129, 106, 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);
}