Progress Bar in Dark Theme does not have a good contrast

[tesonep]

The progress of the system progress bar does not have a good contrast, it requires effort to see the advance of the job.

[jecisc]

I tried to fix this but the Morph methods that refers to the theme are bypassed by Spec styles and I don't know where this is fixed in Spec.

I'll need to discuss with @estebanlm to know how to fix this since Spec does not respect the Theme