addon-jest: Test error logs on dark theme

[ranndev]

Describe the bug
Can't see the logs due to low contrast of text.

To Reproduce
Steps to reproduce the behavior:

1. Enable the dark mode
2. Add the @storybook/addon-jest
3. Add the test results with failed tests
4. Check the error logs

Expected behavior
The background of the logs should be in dark color.

Screenshots

System:
System:
OS: macOS Mojave 10.14.4
CPU: (4) x64 Intel(R) Core(TM) i7-4578U CPU @ 3.00GHz
Binaries:
Node: 10.16.3 - /usr/local/bin/node
Yarn: 1.21.1 - ~/.yarn/bin/yarn
npm: 6.13.4 - /usr/local/bin/npm
Browsers:
Chrome: 79.0.3945.130
Firefox: 70.0.1
Safari: 12.1

Additional context
I'm using the version 5.3.7 of storybook and its addons

[stale]

Hi everyone! Seems like there hasn't been much going on in this issue lately. If there are still questions, comments, or bugs, please feel free to continue the discussion. Unfortunately, we don't have time to get to every issue. We are always open to contributions so please send us a pull request if you would like to help. Inactive issues will be closed after 30 days. Thanks!

[stale]

Hey there, it's me again! I am going close this issue to help our maintainers focus on the current development roadmap instead. If the issue mentioned is still a concern, please open a new ticket and mention this old one. Cheers and thanks for using Storybook!