#AD6439

CSS

:root {
  --monument-valley: #ad6439;
  --monument-valley-rgb: 173 100 57;
  --monument-valley-oklch: oklch(0.577 0.111 49.7);
}

.element {
  color: var(--monument-valley);
  background-color: hsl(22 50% 45%);
  border-color: oklch(0.577 0.111 49.7);
}

Tailwind CSS v4

@theme {
  --color-monument-valley: #ad6439;
  --color-monument-valley-50: #ffedd9;
  --color-monument-valley-100: #ffdec7;
  --color-monument-valley-200: #fcc8a9;
  --color-monument-valley-300: #e5a883;
  --color-monument-valley-400: #d38a62;
  --color-monument-valley-500: #c06e3d;
  --color-monument-valley-600: #a25d35;
  --color-monument-valley-700: #824b2a;
  --color-monument-valley-800: #61351e;
  --color-monument-valley-900: #442414;
  --color-monument-valley-950: #2c1306;
}

SCSS

$monument-valley: #ad6439;
$monument-valley-rgb: 173, 100, 57;
$monument-valley-light: mix(#fff, $monument-valley, 20%);
$monument-valley-dark: mix(#000, $monument-valley, 20%);

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