#5F3400

CSS

:root {
  --brown: #5f3400;
  --brown-rgb: 95 52 0;
  --brown-oklch: oklch(0.371 0.085 62.5);
}

.element {
  color: var(--brown);
  background-color: hsl(33 100% 19%);
  border-color: oklch(0.371 0.085 62.5);
}

Tailwind CSS v4

@theme {
  --color-brown: #5f3400;
  --color-brown-50: #fff1dc;
  --color-brown-100: #fde3cb;
  --color-brown-200: #efcdaf;
  --color-brown-300: #d7af8a;
  --color-brown-400: #c39369;
  --color-brown-500: #ae7948;
  --color-brown-600: #93673d;
  --color-brown-700: #765231;
  --color-brown-800: #583b23;
  --color-brown-900: #3d2917;
  --color-brown-950: #271608;
}

SCSS

$brown: #5f3400;
$brown-rgb: 95, 52, 0;
$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);
}