#A59895

CSS

:root {
  --cortex: #a59895;
  --cortex-rgb: 165 152 149;
  --cortex-oklch: oklch(0.69 0.016 33.1);
}

.element {
  color: var(--cortex);
  background-color: hsl(11 8% 62%);
  border-color: oklch(0.69 0.016 33.1);
}

Tailwind CSS v4

@theme {
  --color-cortex: #a59895;
  --color-cortex-50: #faf4f2;
  --color-cortex-100: #ede6e4;
  --color-cortex-200: #dbd2d0;
  --color-cortex-300: #bfb5b2;
  --color-cortex-400: #a89b98;
  --color-cortex-500: #90837f;
  --color-cortex-600: #7a6f6c;
  --color-cortex-700: #625856;
  --color-cortex-800: #48403f;
  --color-cortex-900: #322c2b;
  --color-cortex-950: #1e1919;
}

SCSS

$cortex: #a59895;
$cortex-rgb: 165, 152, 149;
$cortex-light: mix(#fff, $cortex, 20%);
$cortex-dark: mix(#000, $cortex, 20%);

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