#8C6F56

CSS

:root {
  --pastel-brown: #8c6f56;
  --pastel-brown-rgb: 140 111 86;
  --pastel-brown-oklch: oklch(0.564 0.052 62.2);
}

.element {
  color: var(--pastel-brown);
  background-color: hsl(28 24% 44%);
  border-color: oklch(0.564 0.052 62.2);
}

Tailwind CSS v4

@theme {
  --color-pastel-brown: #8c6f56;
  --color-pastel-brown-50: #fff2e6;
  --color-pastel-brown-100: #f5e5d6;
  --color-pastel-brown-200: #e5d0be;
  --color-pastel-brown-300: #cbb29c;
  --color-pastel-brown-400: #b5987f;
  --color-pastel-brown-500: #a07f63;
  --color-pastel-brown-600: #876b54;
  --color-pastel-brown-700: #6c5643;
  --color-pastel-brown-800: #503e30;
  --color-pastel-brown-900: #382b21;
  --color-pastel-brown-950: #221810;
}

SCSS

$pastel-brown: #8c6f56;
$pastel-brown-rgb: 140, 111, 86;
$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);
}