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In your app.js you're looking at window resize to show and hide the menu button, but you can just do that in your CSS - so your hamburger menu will have display none on desktop but not in mobile.

You're also making life hard for yourself by having styles for mobile and styles for desktop because you're then writing some of the same things twice. What you can do is to write all your styles for mobile or desktop, then use media queries to overwrite anything that changes for desktop/mobile. You can even write a mixin for that! If you haven't discovered Kevin Powell on YouTube yet, then he has some good Sass content

There are a lot of problems that you need to address. For starters, the empty-space after your footer should be removed. Then, your texts are spilling over. So, you also need to take care of those.