Issue 1994 fix

[SofiaCardosoMartins]

Description

In a previous version, the single-line code block appeared with a dark font color, which made it difficult to be noticed. With this changes, the font color was changed to red without it interfering with the multi-line code block theme which is defined in the preferences menu.

Issue fixed

The applied changes were made only in the CSS code, adding new selectors, to distinguish between the single-line and the multi-line code blocks.

Type of changes

• ⚪ Bug fix (Change that fixed an issue)
• 🔘 Breaking change (Change that can cause existing functionality to change)
• ⚪ Improvement (Change that improves the code. Maybe performance or development improvement)
• ⚪ Feature (Change that adds new functionality)
• ⚪ Documentation change (Change that modifies documentation. Maybe typo fixes)

Checklist:

• 🔘 My code follows the project code style
• ⚪ I have written test for my code and it has been tested
• 🔘 All existing tests have been passed
• 🔘 I have attached a screenshot/video to visualize my change if possible

[ZeroX-DG]

@SofiaCardosoMartins Sorry for the wait, I was quite busy these days, I think the red color looks strange in dark theme. Can you create custom color for each theme?
https://github.com/BoostIO/Boostnote/blob/8218d5eb5a4b60bdb2b650d32ac1b3abea048e28/browser/components/markdown.styl#L502-L517
If you can do that then we can fix this issue too: #2373

[ZeroX-DG]

Fixed in #3473