Template:Overflow
This template allows overflown content to scrollable. You just simply need to sandwich the content with this template.
How to use
Example
If you put:
{{Overflow | Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text}}
Then you will get:
Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text Long text