#826755

CSS

:root {
  --pastel-brown: #826755;
  --pastel-brown-rgb: 130 103 85;
  --pastel-brown-oklch: oklch(0.536 0.044 55.3);
}

.element {
  color: var(--pastel-brown);
  background-color: hsl(24 21% 42%);
  border-color: oklch(0.536 0.044 55.3);
}

Tailwind CSS v4

@theme {
  --color-pastel-brown: #826755;
  --color-pastel-brown-50: #fff2e9;
  --color-pastel-brown-100: #f4e5da;
  --color-pastel-brown-200: #e4d0c2;
  --color-pastel-brown-300: #cab2a2;
  --color-pastel-brown-400: #b49886;
  --color-pastel-brown-500: #9e7f6a;
  --color-pastel-brown-600: #856c5a;
  --color-pastel-brown-700: #6b5648;
  --color-pastel-brown-800: #4f3e34;
  --color-pastel-brown-900: #372b24;
  --color-pastel-brown-950: #221812;
}

SCSS

$pastel-brown: #826755;
$pastel-brown-rgb: 130, 103, 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);
}