#A89794

CSS

:root {
  --cortex: #a89794;
  --cortex-rgb: 168 151 148;
  --cortex-oklch: oklch(0.69 0.021 29.6);
}

.element {
  color: var(--cortex);
  background-color: hsl(9 10% 62%);
  border-color: oklch(0.69 0.021 29.6);
}

Tailwind CSS v4

@theme {
  --color-cortex: #a89794;
  --color-cortex-50: #fbf3f1;
  --color-cortex-100: #efe5e4;
  --color-cortex-200: #ddd1cf;
  --color-cortex-300: #c2b4b1;
  --color-cortex-400: #aa9a97;
  --color-cortex-500: #93817e;
  --color-cortex-600: #7d6e6b;
  --color-cortex-700: #645855;
  --color-cortex-800: #49403e;
  --color-cortex-900: #332c2b;
  --color-cortex-950: #1f1918;
}

SCSS

$cortex: #a89794;
$cortex-rgb: 168, 151, 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);
}