Blogr Landing Page - Vanilla HTML CSS and Javascript

I was trying to figure out a more efficient way to write some JS code for the navigation functions but I ended up just settling on what I know. But I did write a forEach() statement correctly so that's a win for today. One thing that I could not figure out was why the mobile view is not properly centered. Seems as though something is too wide but I am unsure what I did because it was fine before I added the media query for the desktop view.