Hi MSzturc, thanks very much for your effort. It looks very good now!
1, regarding Slide Annotations, it changes only the text content’s background color. I’m not sure if it is only a display issue on my computer:
2, regarding backgournd image, if we write something like:
<section data-background-image="test.jpeg" >
## content in markdown
</section>
, this snippet sets the background correctly, but the markdown content is not rendered.