Marco Liberati

This PR now contains only the integration tests. All the bug fix logic has been exported in https://github.com/elastic/kibana/pull/177165

> TBH, with most things CSS-based I would have leaned towards a visual screenshot/diff rather than trying to check the specific CSS output. Not sure we have an infrastructure for...

Can we have an offline sync to discuss this a bit? I see there are few options on the table and discuss it can help clear out a bit some...

Actually this  label colored per category trick may be good also for bar charts

A possible solution to this could be also #856

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