'console' markdown code blocks have black text on a black highlight background

Description of problem:

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

1. go to dev catalog
2. filter by helm charts
3. locate the "vault" helm chart
4. select it and scroll down in the side panel

Actual results:

"console" code block is hard to read:

Expected results:

Typical code block visual:

Reproducibility (Always/Intermittent/Only Once):

always

Build Details:

4.9.0-0.nightly-2021-06-28-083315

Additional info: