#3B3B3B

CSS

:root {
  --dead-pixel: #3b3b3b;
  --dead-pixel-rgb: 59 59 59;
  --dead-pixel-oklch: oklch(0.352 0 0);
}

.element {
  color: var(--dead-pixel);
  background-color: hsl(0 0% 23%);
  border-color: oklch(0.352 0 0);
}

Tailwind CSS v4

@theme {
  --color-dead-pixel: #3b3b3b;
  --color-dead-pixel-50: #f5f5f5;
  --color-dead-pixel-100: #e8e8e8;
  --color-dead-pixel-200: #d4d4d4;
  --color-dead-pixel-300: #b7b7b7;
  --color-dead-pixel-400: #9e9e9e;
  --color-dead-pixel-500: #868686;
  --color-dead-pixel-600: #717171;
  --color-dead-pixel-700: #5b5b5b;
  --color-dead-pixel-800: #424242;
  --color-dead-pixel-900: #2e2e2e;
  --color-dead-pixel-950: #1b1b1b;
}

SCSS

$dead-pixel: #3b3b3b;
$dead-pixel-rgb: 59, 59, 59;
$dead-pixel-light: mix(#fff, $dead-pixel, 20%);
$dead-pixel-dark: mix(#000, $dead-pixel, 20%);

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