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feedback required, pls...

Any suggestions, improvements are welcome....!

I need help with following issues 1)Font-size 2)Height problem - I get confused over height, any suggestions regarding how to use height effectively 3)For hamburger part i would like to know why body{ overflow: hidden; } is not working

I would like to know that the method which I used for styling and spacing is effective or is there any other efficient way to style things with only basic CSS..