#111418

CSS

:root {
  --dark-void: #111418;
  --dark-void-rgb: 17 20 24;
  --dark-void-oklch: oklch(0.19 0.009 255.6);
}

.element {
  color: var(--dark-void);
  background-color: hsl(214 17% 8%);
  border-color: oklch(0.19 0.009 255.6);
}

Tailwind CSS v4

@theme {
  --color-dark-void: #111418;
  --color-dark-void-50: #f3f5f8;
  --color-dark-void-100: #e6e8eb;
  --color-dark-void-200: #d2d4d8;
  --color-dark-void-300: #b4b8bc;
  --color-dark-void-400: #9b9fa4;
  --color-dark-void-500: #82878c;
  --color-dark-void-600: #6e7277;
  --color-dark-void-700: #585b5f;
  --color-dark-void-800: #404346;
  --color-dark-void-900: #2c2e30;
  --color-dark-void-950: #191b1c;
}

SCSS

$dark-void: #111418;
$dark-void-rgb: 17, 20, 24;
$dark-void-light: mix(#fff, $dark-void, 20%);
$dark-void-dark: mix(#000, $dark-void, 20%);

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