#A69892

CSS

:root {
  --cortex: #a69892;
  --cortex-rgb: 166 152 146;
  --cortex-oklch: oklch(0.69 0.019 44.7);
}

.element {
  color: var(--cortex);
  background-color: hsl(18 10% 61%);
  border-color: oklch(0.69 0.019 44.7);
}

Tailwind CSS v4

@theme {
  --color-cortex: #a69892;
  --color-cortex-50: #faf4f1;
  --color-cortex-100: #eee6e3;
  --color-cortex-200: #dbd2ce;
  --color-cortex-300: #c0b5af;
  --color-cortex-400: #a99b95;
  --color-cortex-500: #91837c;
  --color-cortex-600: #7b6f69;
  --color-cortex-700: #625854;
  --color-cortex-800: #48403d;
  --color-cortex-900: #322c2a;
  --color-cortex-950: #1e1918;
}

SCSS

$cortex: #a69892;
$cortex-rgb: 166, 152, 146;
$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);
}