#816A00

CSS

:root {
  --muddy-brown: #816a00;
  --muddy-brown-rgb: 129 106 0;
  --muddy-brown-oklch: oklch(0.531 0.109 93.9);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(49 100% 25%);
  border-color: oklch(0.531 0.109 93.9);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #816a00;
  --color-muddy-brown-50: #fef6d3;
  --color-muddy-brown-100: #f2e8c0;
  --color-muddy-brown-200: #e2d5a0;
  --color-muddy-brown-300: #c8b876;
  --color-muddy-brown-400: #b49d4d;
  --color-muddy-brown-500: #9e8419;
  --color-muddy-brown-600: #86701a;
  --color-muddy-brown-700: #6b5915;
  --color-muddy-brown-800: #50410c;
  --color-muddy-brown-900: #382d07;
  --color-muddy-brown-950: #221a00;
}

SCSS

$muddy-brown: #816a00;
$muddy-brown-rgb: 129, 106, 0;
$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);
}