#8F7154

CSS

:root {
  --decreasing-brown: #8f7154;
  --decreasing-brown-rgb: 143 113 84;
  --decreasing-brown-oklch: oklch(0.571 0.056 65.3);
}

.element {
  color: var(--decreasing-brown);
  background-color: hsl(29 26% 45%);
  border-color: oklch(0.571 0.056 65.3);
}

Tailwind CSS v4

@theme {
  --color-decreasing-brown: #8f7154;
  --color-decreasing-brown-50: #fff3e5;
  --color-decreasing-brown-100: #f5e5d4;
  --color-decreasing-brown-200: #e5d0bb;
  --color-decreasing-brown-300: #cbb299;
  --color-decreasing-brown-400: #b6987c;
  --color-decreasing-brown-500: #a17f5e;
  --color-decreasing-brown-600: #886b50;
  --color-decreasing-brown-700: #6d5640;
  --color-decreasing-brown-800: #513e2e;
  --color-decreasing-brown-900: #382b1f;
  --color-decreasing-brown-950: #23180f;
}

SCSS

$decreasing-brown: #8f7154;
$decreasing-brown-rgb: 143, 113, 84;
$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);
}