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Please feel free to point out any mistakes you've noticed.

I have a problem with the responsiveness of the text especially in portrait mode and I had a problem making the page dark when the nav bar is open, I just replaced it with a blur effect. Please comment what I can use to improve my code and recommend a framework or tool for efficiency.

Thank you.

I really had a hard time with the responsiveness, I should have used display grid.

but hey, I still got it done with flexbox.