#EFECDD

CSS

:root {
  --onion-skin: #efecdd;
  --onion-skin-rgb: 239 236 221;
  --onion-skin-oklch: oklch(0.941 0.02 97.5);
}

.element {
  color: var(--onion-skin);
  background-color: hsl(50 36% 90%);
  border-color: oklch(0.941 0.02 97.5);
}

Tailwind CSS v4

@theme {
  --color-onion-skin: #efecdd;
  --color-onion-skin-50: #f6f5ef;
  --color-onion-skin-100: #e9e8e1;
  --color-onion-skin-200: #d6d5cb;
  --color-onion-skin-300: #bab8ac;
  --color-onion-skin-400: #a19f91;
  --color-onion-skin-500: #8a8678;
  --color-onion-skin-600: #747265;
  --color-onion-skin-700: #5d5b51;
  --color-onion-skin-800: #44423b;
  --color-onion-skin-900: #2f2e28;
  --color-onion-skin-950: #1c1b16;
}

SCSS

$onion-skin: #efecdd;
$onion-skin-rgb: 239, 236, 221;
$onion-skin-light: mix(#fff, $onion-skin, 20%);
$onion-skin-dark: mix(#000, $onion-skin, 20%);

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