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Guys, I need your help, pls!

Got stuck with the responsiveness of the layout. It doesn't seem to be working ok for mobile or tablet and I don't know why. I used media query though.

Could you tell me please if there is any mistake in my code?..(

Hello, everyone! I've accomplished this challenge only for desktop resolution, I'm still confused how I can make it for mobile phone size. Should I use media query?

Any advice or recommendation will be highly appreciated!