#84664C

CSS

:root {
  --pastel-brown: #84664c;
  --pastel-brown-rgb: 132 102 76;
  --pastel-brown-oklch: oklch(0.534 0.054 62.2);
}

.element {
  color: var(--pastel-brown);
  background-color: hsl(28 27% 41%);
  border-color: oklch(0.534 0.054 62.2);
}

Tailwind CSS v4

@theme {
  --color-pastel-brown: #84664c;
  --color-pastel-brown-50: #fff2e5;
  --color-pastel-brown-100: #f5e5d6;
  --color-pastel-brown-200: #e5d0bd;
  --color-pastel-brown-300: #ccb29b;
  --color-pastel-brown-400: #b6987e;
  --color-pastel-brown-500: #a17e61;
  --color-pastel-brown-600: #886b52;
  --color-pastel-brown-700: #6d5642;
  --color-pastel-brown-800: #513e2f;
  --color-pastel-brown-900: #382b20;
  --color-pastel-brown-950: #231810;
}

SCSS

$pastel-brown: #84664c;
$pastel-brown-rgb: 132, 102, 76;
$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);
}