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How to put dynamic value on width and height of the page?

I am building a mobile app and if the page height set on bubble is more than the screen size it scrolls !! and I don’t want that. I can easily find the screen screen size via JavaScript on the page but how to put that value in H and W ?

You can’t you need to use custom CSS

But where to add custom css ?

I put it into an HTML element. Others might use the page header.