#88670C

CSS

:root {
  --muddy-brown: #88670c;
  --muddy-brown-rgb: 136 103 12;
  --muddy-brown-oklch: oklch(0.533 0.105 85.5);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(44 84% 29%);
  border-color: oklch(0.533 0.105 85.5);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #88670c;
  --color-muddy-brown-50: #fff4d4;
  --color-muddy-brown-100: #f7e7c1;
  --color-muddy-brown-200: #e7d2a1;
  --color-muddy-brown-300: #ceb578;
  --color-muddy-brown-400: #bb9a51;
  --color-muddy-brown-500: #a68021;
  --color-muddy-brown-600: #8c6c1f;
  --color-muddy-brown-700: #705719;
  --color-muddy-brown-800: #543f0f;
  --color-muddy-brown-900: #3a2b0a;
  --color-muddy-brown-950: #241800;
}

SCSS

$muddy-brown: #88670c;
$muddy-brown-rgb: 136, 103, 12;
$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);
}