#7F684F

CSS

:root {
  --pastel-brown: #7f684f;
  --pastel-brown-rgb: 127 104 79;
  --pastel-brown-oklch: oklch(0.533 0.047 68.9);
}

.element {
  color: var(--pastel-brown);
  background-color: hsl(31 23% 40%);
  border-color: oklch(0.533 0.047 68.9);
}

Tailwind CSS v4

@theme {
  --color-pastel-brown: #7f684f;
  --color-pastel-brown-50: #fef3e7;
  --color-pastel-brown-100: #f2e6d7;
  --color-pastel-brown-200: #e2d1bf;
  --color-pastel-brown-300: #c7b49e;
  --color-pastel-brown-400: #b19a81;
  --color-pastel-brown-500: #9b8164;
  --color-pastel-brown-600: #836d55;
  --color-pastel-brown-700: #695744;
  --color-pastel-brown-800: #4e3f31;
  --color-pastel-brown-900: #362c21;
  --color-pastel-brown-950: #211911;
}

SCSS

$pastel-brown: #7f684f;
$pastel-brown-rgb: 127, 104, 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);
}