• Go ahead, read the first
  • Then read the code at Github

About your browser

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Test the variants

Bootstrap-Night Toggle between two CSS files
Bootstrap-Nightfall Toggle dark mode on & off using a Δ CSS
Bootstrap-Nightshade Dark mode toggle & store using a <html> tag class
Bootstrap-Dark Automated by browser only

Also try Bootstrap-Unlit (Same as Bootstrap-Dark ... but with dark scheme as default/fallback).

Test the theme

Try a few popular kitchen-sink pages with the Night theme.

Learn some more..