Compton is compositing manager. It will supply us the shadows, transparency, fading in our system. You can read more on the wiki about it.
Let us read and change the compton.conf in ~/.config/i3/compton.conf.
Make backups and then change the settings.
Screentearing issues might be helped with changing glx and xrender.
YOU NEED to log off to see the effects of the changes in compton.conf.
We tell it not to make shadows anymore.
Menu-opacity is changed to 1. No opacity anymore.
Inactive-opacity is set to 1.
Fading is set to false.