Description of the problem:
The details and formatting of the text in the Results and Variables boxes in a executed workflow is very hard to see when the Dark Theme is being used:

In the screen shot above, the keys to the Variables values are practically invisible.
How reproducible: 100%

Steps to reproduce: 

1. Deploy orchestratir using Dark theme in Settings, using v 1.2.0-rc5

2. Execute a workflow, and navigate to the instance page.

Actual results: See above. It's hard to see the formatting and parentheses in the results.

Expected results: Text should be easier to see.