#E1E1E1

CSS

:root {
  --jupiter: #e1e1e1;
  --jupiter-rgb: 225 225 225;
  --jupiter-oklch: oklch(0.91 0 0);
}

.element {
  color: var(--jupiter);
  background-color: hsl(0 0% 88%);
  border-color: oklch(0.91 0 0);
}

Tailwind CSS v4

@theme {
  --color-jupiter: #e1e1e1;
  --color-jupiter-50: #f5f5f5;
  --color-jupiter-100: #e8e8e8;
  --color-jupiter-200: #d4d4d4;
  --color-jupiter-300: #b7b7b7;
  --color-jupiter-400: #9e9e9e;
  --color-jupiter-500: #868686;
  --color-jupiter-600: #717171;
  --color-jupiter-700: #5b5b5b;
  --color-jupiter-800: #424242;
  --color-jupiter-900: #2e2e2e;
  --color-jupiter-950: #1b1b1b;
}

SCSS

$jupiter: #e1e1e1;
$jupiter-rgb: 225, 225, 225;
$jupiter-light: mix(#fff, $jupiter, 20%);
$jupiter-dark: mix(#000, $jupiter, 20%);

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