#7E6851

CSS

:root {
  --pastel-brown: #7e6851;
  --pastel-brown-rgb: 126 104 81;
  --pastel-brown-oklch: oklch(0.532 0.044 67.9);
}

.element {
  color: var(--pastel-brown);
  background-color: hsl(31 22% 41%);
  border-color: oklch(0.532 0.044 67.9);
}

Tailwind CSS v4

@theme {
  --color-pastel-brown: #7e6851;
  --color-pastel-brown-50: #fef3e8;
  --color-pastel-brown-100: #f2e6d8;
  --color-pastel-brown-200: #e1d1c0;
  --color-pastel-brown-300: #c7b4a0;
  --color-pastel-brown-400: #b09a83;
  --color-pastel-brown-500: #9a8167;
  --color-pastel-brown-600: #826d57;
  --color-pastel-brown-700: #685746;
  --color-pastel-brown-800: #4d3f32;
  --color-pastel-brown-900: #362c22;
  --color-pastel-brown-950: #211911;
}

SCSS

$pastel-brown: #7e6851;
$pastel-brown-rgb: 126, 104, 81;
$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);
}