#AA6235

CSS

:root {
  --monument-valley: #aa6235;
  --monument-valley-rgb: 170 98 53;
  --monument-valley-oklch: oklch(0.569 0.111 50.9);
}

.element {
  color: var(--monument-valley);
  background-color: hsl(23 52% 44%);
  border-color: oklch(0.569 0.111 50.9);
}

Tailwind CSS v4

@theme {
  --color-monument-valley: #aa6235;
  --color-monument-valley-50: #ffedd8;
  --color-monument-valley-100: #ffdfc6;
  --color-monument-valley-200: #fbc8a9;
  --color-monument-valley-300: #e5a882;
  --color-monument-valley-400: #d38b60;
  --color-monument-valley-500: #bf6e3c;
  --color-monument-valley-600: #a25e34;
  --color-monument-valley-700: #824b29;
  --color-monument-valley-800: #61361d;
  --color-monument-valley-900: #442513;
  --color-monument-valley-950: #2c1305;
}

SCSS

$monument-valley: #aa6235;
$monument-valley-rgb: 170, 98, 53;
$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);
}