#F9F8FC

CSS

:root {
  --french-porcelain: #f9f8fc;
  --french-porcelain-rgb: 249 248 252;
  --french-porcelain-oklch: oklch(0.981 0.005 297.7);
}

.element {
  color: var(--french-porcelain);
  background-color: hsl(255 40% 98%);
  border-color: oklch(0.981 0.005 297.7);
}

Tailwind CSS v4

@theme {
  --color-french-porcelain: #f9f8fc;
  --color-french-porcelain-50: #f5f5f6;
  --color-french-porcelain-100: #e8e7e9;
  --color-french-porcelain-200: #d4d4d6;
  --color-french-porcelain-300: #b8b7ba;
  --color-french-porcelain-400: #9f9ea1;
  --color-french-porcelain-500: #868589;
  --color-french-porcelain-600: #727174;
  --color-french-porcelain-700: #5b5a5d;
  --color-french-porcelain-800: #424244;
  --color-french-porcelain-900: #2e2d2f;
  --color-french-porcelain-950: #1b1a1c;
}

SCSS

$french-porcelain: #f9f8fc;
$french-porcelain-rgb: 249, 248, 252;
$french-porcelain-light: mix(#fff, $french-porcelain, 20%);
$french-porcelain-dark: mix(#000, $french-porcelain, 20%);

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