How can I disable the vertical overflow scrollbar from a template element?

I want to use a template node to show content (e.g. a list of missed phone calls), which shows the relevant information (e.g. last three calls) in the space that's available, but which can be scrolled to see more.

So if I put more content than the space available, the node gets a vertical scrollbar in my PC's web browser (e.g. not on my Samsung tablet). How can I hide the scrollbar in every browser (on the tablet I can scroll by dragging the content, on the PC it works with the scrollwheel of my mouse)?

I already found this, but it does not seem to work for me:

Manfred