H5P Course Presentation: Background becomes too dark when opening text button / background opacity setting has no effect
Description
The H5P Course Presentation content type behaves incorrectly, or differently than before, when viewing explanatory texts that are opened via buttons.
When a text element configured as a button is clicked, the slide background is darkened so strongly that the background image is no longer visible. This is problematic for scenarios where the explanatory text intentionally refers to elements in the image behind it.