Bug(Night Mode): Embedded comments are hard to read

[healeycodes]

Describe the bug
With Night Mode enabled, embedded comments in articles are hard to read.

They show up as black text against a dark blue background.

To Reproduce
With Night Mode enabled, go to an article that embeds comments.

Such as https://dev.to/devteam/top-5-dev-comments-from-the-past-week-gia

Screenshots

Desktop:

• OS: Windows 10 OS Build 17134.648
• Browser: Chrome
• Version: 73.0.3683.86 (Official Build) (64-bit) (cohort: Stable)

[theNaut1lus]

I am able to reproduce this issue on both Safari and Firefox.

@healeycodes @jessleenyc I would like to take up this issue and work on it

[healeycodes]

Feel free @co16353sidak! I claim no ownership 😄

[theNaut1lus]

I have implemented some designs which I think should be sufficient for the embedded code blocks.

Following the style followed in the default mode, I made the changes accordingly in the night mode as:

Would love it if someone had a look at this first before I submit a PR for the same.
@jessleenyc @benhalpern