#8E7155

CSS

:root {
  --decreasing-brown: #8e7155;
  --decreasing-brown-rgb: 142 113 85;
  --decreasing-brown-oklch: oklch(0.57 0.055 65.4);
}

.element {
  color: var(--decreasing-brown);
  background-color: hsl(29 25% 45%);
  border-color: oklch(0.57 0.055 65.4);
}

Tailwind CSS v4

@theme {
  --color-decreasing-brown: #8e7155;
  --color-decreasing-brown-50: #fff3e5;
  --color-decreasing-brown-100: #f5e5d5;
  --color-decreasing-brown-200: #e5d0bc;
  --color-decreasing-brown-300: #cbb39a;
  --color-decreasing-brown-400: #b5987d;
  --color-decreasing-brown-500: #a07f60;
  --color-decreasing-brown-600: #876c51;
  --color-decreasing-brown-700: #6c5641;
  --color-decreasing-brown-800: #503e2f;
  --color-decreasing-brown-900: #382b1f;
  --color-decreasing-brown-950: #22180f;
}

SCSS

$decreasing-brown: #8e7155;
$decreasing-brown-rgb: 142, 113, 85;
$decreasing-brown-light: mix(#fff, $decreasing-brown, 20%);
$decreasing-brown-dark: mix(#000, $decreasing-brown, 20%);

.element {
  color: $decreasing-brown;
  box-shadow: 0 0 0 2px rgba($decreasing-brown, 0.35);
}