Hey Guys,
Here is my JavaScript calculator project. have a look and give your feedback.
Codepen link: https://codepen.io/maneesh8040/full/pozaqqz
The design looks really old. Would be cool if you style it a bit otherwise then that. Nicely done with JS. One day I want to be as good as you with it :3
Try to count:
2.33333 - 50 
Maybe add keyboard support.
Overall good job 
Some different colours would be good. All black is a little difficult to look at. And maybe increase the font on the buttons.
Good job!