feat: background and font color for codeblocks

[phvm]

What is the purpose of this pull request?

Change the background color and font colors for codeblocks

What problem is this solving?

Enhance the visibility and accessibility of codeblocks

How should this be manually tested?

Screenshots or example usage

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Requires change to documentation, which has been updated accordingly.

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