I noticed some third party plugins or components modify the inline styles of the body element.
For example, when opening and closing a burger menu some set the overflow attribute to an empty string overflow: '', which results in fullPages.js not being scrollable anymore when in responsive mode.

It basically overwrites the inline attribute fullPage.js sets on the body, which is overflow: visible;.
And then it inherits the one from .fp-enabled body, html.fp-enabled which is overflow: hidden.

So I'm thinking we can probably:

1- Set those inline attributes with !important.
2- Or instead create a new class for those also with !important on them.

This will make it a bit more resistant to third-party plugins playing with those properties. Although it won't make it resistant to other !important declarations.

Reproduction:

https://codepen.io/alvarotrigo/pen/eYqBoBb

Steps

1. Access https://codepen.io/alvarotrigo/pen/eYqBoBb
2. Click on the buton
3. Try to scroll down