#653C0D

CSS

:root {
  --brown: #653c0d;
  --brown-rgb: 101 60 13;
  --brown-oklch: oklch(0.397 0.082 63.9);
}

.element {
  color: var(--brown);
  background-color: hsl(32 77% 22%);
  border-color: oklch(0.397 0.082 63.9);
}

Tailwind CSS v4

@theme {
  --color-brown: #653c0d;
  --color-brown-50: #fff1dd;
  --color-brown-100: #fce3cc;
  --color-brown-200: #edceb0;
  --color-brown-300: #d5b08b;
  --color-brown-400: #c1946b;
  --color-brown-500: #ac7a4a;
  --color-brown-600: #92683f;
  --color-brown-700: #755332;
  --color-brown-800: #573c24;
  --color-brown-900: #3d2918;
  --color-brown-950: #261709;
}

SCSS

$brown: #653c0d;
$brown-rgb: 101, 60, 13;
$brown-light: mix(#fff, $brown, 20%);
$brown-dark: mix(#000, $brown, 20%);

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