Crystalline

CSS

:root {
  --crystalline: #e9e3de;
  --crystalline-rgb: 233 227 222;
  --crystalline-oklch: oklch(0.919 0.009 62.6);
}

.element {
  color: var(--crystalline);
  background-color: hsl(27 20% 89%);
  border-color: oklch(0.919 0.009 62.6);
}

Tailwind CSS v4

@theme {
  --color-crystalline: #e9e3de;
  --color-crystalline-50: #f7f5f2;
  --color-crystalline-100: #eae7e5;
  --color-crystalline-200: #d7d3d0;
  --color-crystalline-300: #bbb6b2;
  --color-crystalline-400: #a39d99;
  --color-crystalline-500: #8b8580;
  --color-crystalline-600: #75706c;
  --color-crystalline-700: #5e5a57;
  --color-crystalline-800: #45423f;
  --color-crystalline-900: #302d2b;
  --color-crystalline-950: #1c1a19;
}

SCSS

$crystalline: #e9e3de;
$crystalline-rgb: 233, 227, 222;
$crystalline-light: mix(#fff, $crystalline, 20%);
$crystalline-dark: mix(#000, $crystalline, 20%);

.element {
  color: $crystalline;
  box-shadow: 0 0 0 2px rgba($crystalline, 0.35);
}