Adding Collapsible menu in nav bar

Hello All,
I want to add an option like this.
Screenshot%20from%202019-05-07%2015-18-08

On which when i click, this should open

But at ghost i added
https://www.w3schools.com/howto/tryit.asp?filename=tryhow_css_mega_menu_responsive

I had put styling in default.hbs and html part in site-nav.hbs.
But when i hover or click it, it changes the colour but menu does not open up.

And when i tried collapsible bootstrap

https://www.w3schools.com/bootstrap/tryit.asp?filename=trybs_collapsible&stacked=h

Screenshot%20from%202019-05-07%2015-30-39

And when i click it then.

Please help me out.

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