After a short break (my computer died 
) I am back at it! I’ve been working on this here calculator and I’d love to hear what people think. I haven’t done any styling work yet, I’ve been focusing purely on the functionality so far, so it looks terrible. Also, if you get a big enough number it will overflow the container. I’m sharing it now despite that because I really want to know what people think about the code, I think it’s the best/cleanest project I’ve done yet, but there are still a few kludgey parts. Thanks in advance to anyone who takes the time 
Edit: I’ve tested it in the latest versions of Firefox, Chrome, and Vivaldi, and it works as intended in all of them so far. I haven’t yet worked on making it suitable for mobile devices, but I’d love to hear how/if it works on them nevertheless.
Here’s the site: JS Calculator on Github
Here’s the code: Main Github page for the project