#8A6F5A

CSS

:root {
  --pastel-brown: #8a6f5a;
  --pastel-brown-rgb: 138 111 90;
  --pastel-brown-oklch: oklch(0.562 0.046 59.5);
}

.element {
  color: var(--pastel-brown);
  background-color: hsl(26 21% 45%);
  border-color: oklch(0.562 0.046 59.5);
}

Tailwind CSS v4

@theme {
  --color-pastel-brown: #8a6f5a;
  --color-pastel-brown-50: #fff3e8;
  --color-pastel-brown-100: #f4e5d9;
  --color-pastel-brown-200: #e3d0c1;
  --color-pastel-brown-300: #c9b3a0;
  --color-pastel-brown-400: #b49884;
  --color-pastel-brown-500: #9e7f68;
  --color-pastel-brown-600: #856c58;
  --color-pastel-brown-700: #6b5646;
  --color-pastel-brown-800: #4f3f33;
  --color-pastel-brown-900: #372b22;
  --color-pastel-brown-950: #221812;
}

SCSS

$pastel-brown: #8a6f5a;
$pastel-brown-rgb: 138, 111, 90;
$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);
}