fix: Fix font color bug when switching to dark theme

[lorenzobalzani]

Description

When switching to the dark theme, some code blocks become unreadable.

Example

Regarding this post in the example site.

Before

After

Issue Number:

No issue was created for this PR.

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Checklist

Yes, I included all necessary artifacts, including:

• [ ] Tests
• [ ] Documentation
• [x] Implementation (Code and Ressources)
• [ ] Example

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Testing Checklist

Yes, I ensured that all of the following scenarios were tested:

• [x] Desktop Light Mode (Default)
• [x] Desktop Dark Mode
• [ ] Desktop Light RTL Mode
• [ ] Desktop Dark RTL Mode
• [x] Mobile Light Mode
• [x] Mobile Dark Mode
• [ ] Mobile Light RTL Mode
• [ ] Mobile Dark RTL Mode

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