#7F6600

CSS

:root {
  --muddy-brown: #7f6600;
  --muddy-brown-rgb: 127 102 0;
  --muddy-brown-oklch: oklch(0.52 0.106 91.9);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(48 100% 25%);
  border-color: oklch(0.52 0.106 91.9);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #7f6600;
  --color-muddy-brown-50: #fff5d3;
  --color-muddy-brown-100: #f3e8c0;
  --color-muddy-brown-200: #e3d4a1;
  --color-muddy-brown-300: #c9b777;
  --color-muddy-brown-400: #b59c50;
  --color-muddy-brown-500: #a0831f;
  --color-muddy-brown-600: #876f1d;
  --color-muddy-brown-700: #6c5917;
  --color-muddy-brown-800: #51400e;
  --color-muddy-brown-900: #382c09;
  --color-muddy-brown-950: #231900;
}

SCSS

$muddy-brown: #7f6600;
$muddy-brown-rgb: 127, 102, 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);
}