Broken Pixel play online

You are an ordinary computer science teacher, sitting at your computer, preparing a presentation for the next lesson.
But suddenly you notice some strange dot on the screen. You try to remove it, but it does not disappear. Of course you can call the master, but why? You're a computer science teacher, you can fix it yourself.
You just poke at the screen and think that it will help. In the meantime, you only create more dots on the screen. Then you decided to try changing the screen saver on your desktop, turned on music to make it easier to work, updated the driver for sounds. Nothing helped. What will you do in the end, and how will you fix this pixel?

Tap the screen and get clicks for it. Buy various improvements for clicks, and find out the incredible ending. Good luck!