#8B7000

CSS

:root {
  --muddy-brown: #8b7000;
  --muddy-brown-rgb: 139 112 0;
  --muddy-brown-oklch: oklch(0.555 0.114 92);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(48 100% 27%);
  border-color: oklch(0.555 0.114 92);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #8b7000;
  --color-muddy-brown-50: #fff5d1;
  --color-muddy-brown-100: #f4e8be;
  --color-muddy-brown-200: #e4d49d;
  --color-muddy-brown-300: #cab772;
  --color-muddy-brown-400: #b69c48;
  --color-muddy-brown-500: #a18308;
  --color-muddy-brown-600: #886f0f;
  --color-muddy-brown-700: #6d590d;
  --color-muddy-brown-800: #524006;
  --color-muddy-brown-900: #392c05;
  --color-muddy-brown-950: #231900;
}

SCSS

$muddy-brown: #8b7000;
$muddy-brown-rgb: 139, 112, 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);
}