#EFEFEF

CSS

:root {
  --super-silver: #efefef;
  --super-silver-rgb: 239 239 239;
  --super-silver-oklch: oklch(0.952 0 0);
}

.element {
  color: var(--super-silver);
  background-color: hsl(0 0% 94%);
  border-color: oklch(0.952 0 0);
}

Tailwind CSS v4

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

SCSS

$super-silver: #efefef;
$super-silver-rgb: 239, 239, 239;
$super-silver-light: mix(#fff, $super-silver, 20%);
$super-silver-dark: mix(#000, $super-silver, 20%);

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