Time Tracking Dashboard using pure HTML, CSS and JS

This is my second solution submitted here. I could recap a lot of things building this one and I fell excited moving forward for more challenges. I didn't use mobile-first design principles but I was able to realize some things to start with it in my next project. I haven't used anything but pure HTML, CSS and JavaScript and it made me feel like I could make it faster if I have used frameworks. Perhaps now I can finally start to grow my knowledge about them.

I appreciate feedback on whatever you think is necessary to be improved. Do my tags on HTML need changes to be more accessible? Did I forget something that could make development and maintenance easier? Anything you might think that is useful for me to know, please be free to share. Thanks, in advance.