Calculator app main project

I do not feel proud for finishing it as it took me way too long, weeks. I did it alone , I guess that's good, but then I've done all my projects alone and don't feel proud of any . It's finished at last at least. Themes and all, preferences are saved using localStorage.

The hardest was dealing with octalnumber and divide by zero erros, using regular expressions. I also had trouble getting the themes to work at first, when I tried to use prefers-color-scheme. I managed it using JS instead. Also hard was dealing with user entries such as +-/3-9 etc. I feel it's probably buggy still, even though I debugged it with wacky entries etc.