#A79795

CSS

:root {
  --cortex: #a79795;
  --cortex-rgb: 167 151 149;
  --cortex-oklch: oklch(0.69 0.019 26.2);
}

.element {
  color: var(--cortex);
  background-color: hsl(7 9% 62%);
  border-color: oklch(0.69 0.019 26.2);
}

Tailwind CSS v4

@theme {
  --color-cortex: #a79795;
  --color-cortex-50: #fbf3f2;
  --color-cortex-100: #eee6e4;
  --color-cortex-200: #dcd1d0;
  --color-cortex-300: #c1b4b2;
  --color-cortex-400: #aa9a98;
  --color-cortex-500: #93827f;
  --color-cortex-600: #7c6e6c;
  --color-cortex-700: #635856;
  --color-cortex-800: #49403f;
  --color-cortex-900: #332c2b;
  --color-cortex-950: #1e1919;
}

SCSS

$cortex: #a79795;
$cortex-rgb: 167, 151, 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);
}