#82691C

CSS

:root {
  --muddy-brown: #82691c;
  --muddy-brown-rgb: 130 105 28;
  --muddy-brown-oklch: oklch(0.531 0.097 90);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(45 65% 31%);
  border-color: oklch(0.531 0.097 90);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #82691c;
  --color-muddy-brown-50: #fff5d6;
  --color-muddy-brown-100: #f3e8c4;
  --color-muddy-brown-200: #e3d4a5;
  --color-muddy-brown-300: #c9b67e;
  --color-muddy-brown-400: #b59c58;
  --color-muddy-brown-500: #9f832f;
  --color-muddy-brown-600: #876f29;
  --color-muddy-brown-700: #6c5921;
  --color-muddy-brown-800: #504016;
  --color-muddy-brown-900: #382c0e;
  --color-muddy-brown-950: #231902;
}

SCSS

$muddy-brown: #82691c;
$muddy-brown-rgb: 130, 105, 28;
$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);
}