Nero

CSS

:root {
  --nero: #252525;
  --nero-rgb: 37 37 37;
  --nero-oklch: oklch(0.264 0 0);
}

.element {
  color: var(--nero);
  background-color: hsl(0 0% 15%);
  border-color: oklch(0.264 0 0);
}

Tailwind CSS v4

@theme {
  --color-nero: #252525;
  --color-nero-50: #f5f5f5;
  --color-nero-100: #e8e8e8;
  --color-nero-200: #d4d4d4;
  --color-nero-300: #b7b7b7;
  --color-nero-400: #9e9e9e;
  --color-nero-500: #868686;
  --color-nero-600: #717171;
  --color-nero-700: #5b5b5b;
  --color-nero-800: #424242;
  --color-nero-900: #2e2e2e;
  --color-nero-950: #1b1b1b;
}

SCSS

$nero: #252525;
$nero-rgb: 37, 37, 37;
$nero-light: mix(#fff, $nero, 20%);
$nero-dark: mix(#000, $nero, 20%);

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