Todo App - Fully animated - Local Storage - Responsive (after refresh)

Only real problem is that my script for turning the website responsive only works if the browser is refreshed. I've tried using setInterval(runFunction, 1000) but it just wouldn't update. Other problem is not that big, it has more todo with my laziness, the styles files are not properly organised and properly formatted. The .js script has around 50% of its functions commented.

Overall the project was real fun and productive. It really challenged my skills, specially javascript.

Edit 1: Forgot to mention that for some reason "word-spacing" wasn't working aswell...

Credits to Dev Ed's "Beginner Vanilla Javascript Project Tutorial" video.