Help in horizontal navbar with dropdown position sticky not working

Question

I made a horizontal navbar with a dropdown and tried to sticky that on top but it is not working you can click on the below link and see the code if possible write what I have done wrong in the CSS editor as a comment which will help me the most. Thank you.

Here is the link:
https://www.sololearn.com/compiler-playground/W7dIqWeNztA1

Answer 1

Are you attempting to achieve this https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_navbar_sticky ?

If so you will need to add the Javascript part.

Answer 2

https://code.sololearn.com/W7dIqWeNztA1/?ref=app

Answer 3

but that is possible without Javascript also you can see this code which I have tried before and in this, it is working that time you can see it by clicking on the below link

https://www.sololearn.com/compiler-playground/WV1bHucq0xoz