Invert colors of compiling indicator (#13995)
Invert colors of compiling indicator (#13995)

Hi,

This PR inverts the colors for the compiling indicator, closes #13952.

The second commit makes the styling consistent with the prerender indicator (height and border)

From:
![before](https://user-images.githubusercontent.com/32001471/84236653-df640080-aaef-11ea-8532-a5d65cab5cc3.gif)

To:
![after](https://user-images.githubusercontent.com/32001471/84247287-c6fbe200-aaff-11ea-9eff-a16c42a7b625.gif)



 
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