In the Dark

CSS

:root {
  --in-the-dark: #3b3c41;
  --in-the-dark-rgb: 59 60 65;
  --in-the-dark-oklch: oklch(0.357 0.009 276.9);
}

.element {
  color: var(--in-the-dark);
  background-color: hsl(230 5% 24%);
  border-color: oklch(0.357 0.009 276.9);
}

Tailwind CSS v4

@theme {
  --color-in-the-dark: #3b3c41;
  --color-in-the-dark-50: #f4f5f8;
  --color-in-the-dark-100: #e7e7eb;
  --color-in-the-dark-200: #d3d4d8;
  --color-in-the-dark-300: #b6b7bc;
  --color-in-the-dark-400: #9d9ea4;
  --color-in-the-dark-500: #84868c;
  --color-in-the-dark-600: #707176;
  --color-in-the-dark-700: #5a5a5f;
  --color-in-the-dark-800: #414245;
  --color-in-the-dark-900: #2d2e30;
  --color-in-the-dark-950: #1a1a1c;
}

SCSS

$in-the-dark: #3b3c41;
$in-the-dark-rgb: 59, 60, 65;
$in-the-dark-light: mix(#fff, $in-the-dark, 20%);
$in-the-dark-dark: mix(#000, $in-the-dark, 20%);

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