#A49894

CSS

:root {
  --cortex: #a49894;
  --cortex-rgb: 164 152 148;
  --cortex-oklch: oklch(0.689 0.015 39.4);
}

.element {
  color: var(--cortex);
  background-color: hsl(15 8% 61%);
  border-color: oklch(0.689 0.015 39.4);
}

Tailwind CSS v4

@theme {
  --color-cortex: #a49894;
  --color-cortex-50: #f9f4f2;
  --color-cortex-100: #ede6e4;
  --color-cortex-200: #dad2cf;
  --color-cortex-300: #bfb5b1;
  --color-cortex-400: #a79c98;
  --color-cortex-500: #90837f;
  --color-cortex-600: #7a6f6b;
  --color-cortex-700: #615956;
  --color-cortex-800: #47413f;
  --color-cortex-900: #312d2b;
  --color-cortex-950: #1d1a18;
}

SCSS

$cortex: #a49894;
$cortex-rgb: 164, 152, 148;
$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);
}