#AA9691

CSS

:root {
  --cortex: #aa9691;
  --cortex-rgb: 170 150 145;
  --cortex-oklch: oklch(0.689 0.025 34.3);
}

.element {
  color: var(--cortex);
  background-color: hsl(12 13% 62%);
  border-color: oklch(0.689 0.025 34.3);
}

Tailwind CSS v4

@theme {
  --color-cortex: #aa9691;
  --color-cortex-50: #fcf3f0;
  --color-cortex-100: #f0e5e2;
  --color-cortex-200: #dfd1cd;
  --color-cortex-300: #c4b3af;
  --color-cortex-400: #ad9a95;
  --color-cortex-500: #96817b;
  --color-cortex-600: #7f6d68;
  --color-cortex-700: #665753;
  --color-cortex-800: #4b3f3d;
  --color-cortex-900: #342c2a;
  --color-cortex-950: #1f1917;
}

SCSS

$cortex: #aa9691;
$cortex-rgb: 170, 150, 145;
$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);
}