Base Apperal Project with only HTML/CSS form validation

What are you most proud of, and what would you do differently next time?

I applied some new CSS organization I have been learning. I also implemented form verification using the default browser verification using HTML/CSS only.

What challenges did you encounter, and how did you overcome them?

Got caught on silly things like setting up my grid for the desktop and some overflows.

What specific areas of your project would you like help with?

I would like with the semantics and accessibility of my html. What is the best way to handle the visibility of the error messages? Do I need aria labels for that?