Not everyone has the opportunity to buy expensive backlit keyboards (aka logitech illuminated keyboard), not all expensive keyboards are suitable for people for moral, aesthetic, or practical reasons. This video manual shows how for ~ $ 5 to make the backlight for the keyboard, which turns on / off when you press the unused Scroll button. The manual is purely practical and does not claim to be a visual Wow effect, but if desired, the design can be made in a more beautiful way.