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Hi @MohamedHussein05, awesome work on this solution!

Some suggestions for you:

1. You can try to follow a CSS naming convention called BEM. You can watch this video for more information link to video.
2. I don't recommend using em unit for font size because it can get tricky if there is deep nesting, you can try to use another unit called rem. Here is a link to an article that explains when to use which unit link to Article

I hope this helps, good luck!