Can somebody help me with responsive navigation bar?

Question

https://codepen.io/Androcool/pen/XqBxGp
i put all the code i need just like what w3schools tell me to do
but instead of using div, i use ul, li and a
can somebody help me???

this is where i copy the codes
https://www.w3schools.com/howto/howto_js_topnav_responsive.asp

Answer 1

What should it look like?

https://code.sololearn.com/Wm0KN19QFcpe/?ref=app

Answer 2

@rajeeb its about the navigation bar