#88730B

CSS

:root {
  --muddy-brown: #88730b;
  --muddy-brown-rgb: 136 115 11;
  --muddy-brown-oklch: oklch(0.559 0.112 95.9);
}

.element {
  color: var(--muddy-brown);
  background-color: hsl(50 85% 29%);
  border-color: oklch(0.559 0.112 95.9);
}

Tailwind CSS v4

@theme {
  --color-muddy-brown: #88730b;
  --color-muddy-brown-50: #fdf6d2;
  --color-muddy-brown-100: #f1e9bf;
  --color-muddy-brown-200: #e1d59e;
  --color-muddy-brown-300: #c6b874;
  --color-muddy-brown-400: #b29e4b;
  --color-muddy-brown-500: #9d8512;
  --color-muddy-brown-600: #847115;
  --color-muddy-brown-700: #6a5a11;
  --color-muddy-brown-800: #4f4109;
  --color-muddy-brown-900: #372d06;
  --color-muddy-brown-950: #221a00;
}

SCSS

$muddy-brown: #88730b;
$muddy-brown-rgb: 136, 115, 11;
$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);
}