How to read iBooks as "White on Black" on iPad

If you want to keep others awake from the glare or don't want to strain your eyes while reading books on your iPad, you can switch to white text on a black background.How to enable "White on Black" feature on iBooks app, Kindle eBooksOn the Home screen, tap Settings > General > Accessibility, then switch �White on Black� to �ON�.Now you can launch iBooks or Kindle app, and enjoy.