#85664F

CSS

:root {
  --pastel-brown: #85664f;
  --pastel-brown-rgb: 133 102 79;
  --pastel-brown-oklch: oklch(0.535 0.053 57.9);
}

.element {
  color: var(--pastel-brown);
  background-color: hsl(26 25% 42%);
  border-color: oklch(0.535 0.053 57.9);
}

Tailwind CSS v4

@theme {
  --color-pastel-brown: #85664f;
  --color-pastel-brown-50: #fff2e7;
  --color-pastel-brown-100: #f6e4d7;
  --color-pastel-brown-200: #e6d0be;
  --color-pastel-brown-300: #ccb29d;
  --color-pastel-brown-400: #b79780;
  --color-pastel-brown-500: #a17e64;
  --color-pastel-brown-600: #886b55;
  --color-pastel-brown-700: #6d5543;
  --color-pastel-brown-800: #513e31;
  --color-pastel-brown-900: #382b21;
  --color-pastel-brown-950: #231810;
}

SCSS

$pastel-brown: #85664f;
$pastel-brown-rgb: 133, 102, 79;
$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);
}