Height of embedded note - CSS

[StefanS]

Things I have tried

I tried to figure out with the inspector what CSS code I’d have to change, but I couldn’t

What I’m trying to do

I want to embed blocks of other notes into my current note.
The result currently looks like this:

Question:
How can I make sure, that there is not that much spaces wasted?
I’d like to have the height of the embedded box only as big as needed.