#836B55

CSS

:root {
  --pastel-brown: #836b55;
  --pastel-brown-rgb: 131 107 85;
  --pastel-brown-oklch: oklch(0.545 0.045 64.2);
}

.element {
  color: var(--pastel-brown);
  background-color: hsl(29 21% 42%);
  border-color: oklch(0.545 0.045 64.2);
}

Tailwind CSS v4

@theme {
  --color-pastel-brown: #836b55;
  --color-pastel-brown-50: #fef3e8;
  --color-pastel-brown-100: #f3e5d9;
  --color-pastel-brown-200: #e2d1c1;
  --color-pastel-brown-300: #c8b3a0;
  --color-pastel-brown-400: #b29983;
  --color-pastel-brown-500: #9c8067;
  --color-pastel-brown-600: #846d58;
  --color-pastel-brown-700: #695746;
  --color-pastel-brown-800: #4e3f33;
  --color-pastel-brown-900: #362b22;
  --color-pastel-brown-950: #211911;
}

SCSS

$pastel-brown: #836b55;
$pastel-brown-rgb: 131, 107, 85;
$pastel-brown-light: mix(#fff, $pastel-brown, 20%);
$pastel-brown-dark: mix(#000, $pastel-brown, 20%);

.element {
  color: $pastel-brown;
  box-shadow: 0 0 0 2px rgba($pastel-brown, 0.35);
}