All solutions

I tried to write the script as clean as possible but couldn't come up with any idea to make it cleaner and avoid repeating. and I had a lot of trouble on styling. I'll appreciate any help.

first time working with JSON files it was a lot of fun. styling was a little bit hard. any tips for improvement style or script?

couldn't find a way to write it with just HTML and CSS. any solutions?

I used insertAdjacentHTML to display error message but couldn't find any way to remove it after some seconds so after clicking on button again it doesn't display error over and over any solution?

it is my first attempt in css... any improvments?