v4: can't scroll the window in standalone tests

[brandyscarney]

Bug Report

Visit a standalone test and try to scroll down.

I think we need to move the CSS rules for body so that they only get applied if ion-app exists. The alternative is to split the extra CSS styles into smaller bundles to include so that we can only include the colors if needed.

[brandyscarney]

@manucorporat Let me know your thoughts on this

[ionitron-bot]

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