Conditional styling shouldn't change anything outside the parent selector

[shaiquie-zieye]

Describe the issue

One would expect that nothing is changed by Pico outside the parent selector.

Current Behavior

The background color of input tags is changed.

Expected Behavior

The background color of input tags is untouched.

Reproduction URL

The Conditional styling example outlines this beahvior very well.

[dev-willis]

I think this is the same as #533