#886705

CSS

:root {
  --muddy-brown: #886705;
  --muddy-brown-rgb: 136 103 5;
  --muddy-brown-oklch: oklch(0.533 0.107 86.1);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(45 93% 28%);
  border-color: oklch(0.533 0.107 86.1);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #886705;
  --color-muddy-brown-50: #fff4d3;
  --color-muddy-brown-100: #f7e7c0;
  --color-muddy-brown-200: #e7d2a0;
  --color-muddy-brown-300: #ceb576;
  --color-muddy-brown-400: #bb9a4f;
  --color-muddy-brown-500: #a6801c;
  --color-muddy-brown-600: #8c6d1c;
  --color-muddy-brown-700: #705716;
  --color-muddy-brown-800: #543f0d;
  --color-muddy-brown-900: #3a2b08;
  --color-muddy-brown-950: #241800;
}

SCSS

$muddy-brown: #886705;
$muddy-brown-rgb: 136, 103, 5;
$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);
}