The End

CSS

:root {
  --the-end: #2a2a2a;
  --the-end-rgb: 42 42 42;
  --the-end-oklch: oklch(0.285 0 0);
}

.element {
  color: var(--the-end);
  background-color: hsl(0 0% 16%);
  border-color: oklch(0.285 0 0);
}

Tailwind CSS v4

@theme {
  --color-the-end: #2a2a2a;
  --color-the-end-50: #f5f5f5;
  --color-the-end-100: #e8e8e8;
  --color-the-end-200: #d4d4d4;
  --color-the-end-300: #b7b7b7;
  --color-the-end-400: #9e9e9e;
  --color-the-end-500: #868686;
  --color-the-end-600: #717171;
  --color-the-end-700: #5b5b5b;
  --color-the-end-800: #424242;
  --color-the-end-900: #2e2e2e;
  --color-the-end-950: #1b1b1b;
}

SCSS

$the-end: #2a2a2a;
$the-end-rgb: 42, 42, 42;
$the-end-light: mix(#fff, $the-end, 20%);
$the-end-dark: mix(#000, $the-end, 20%);

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