Callout text/background become invisible in Reading mode. How to fix ? (pictures provided)

[ariehen]

I agree with

There’s a topic here on using the inspector:

Obsidian CSS Inspector Workflow

Obsidian CSS Inspector Workflow This was originally called “Obsidian CSS Quick Guide” but it ended up being more focused on the inspector. As a retrospective change to help people use this as a resource, it has been renamed. – FireIsGood Hi friends! CSS in Obsidian can be confusing to get into, so this is a guide to get you started with information on the tools, methods, and some background knowledge! Let’s get started by looking at how you can look behind the curtain of Obsidian’s visuals. …

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Also, a tried and true troubleshooting technique: turn everything off and start enabling things slowly to see when the issue shows up.

For CSS, I’d comment out any custom CSS you have, and start uncommenting sections. When the issue shows up, you’ll know what section or exact rule/declaration that’s causing the issue.