[Help] How do I make text disappear when it reaches the top of the screen?

As you will see in the screenshot below, I've created a background for my Twine game. The background includes a Notepad document that I would like the text to lay on top of. However, if the passage is too long and the player needs to scroll through the text then the uppermost part of the passage runs over the document border.



Is there anyway that I can make the text disappear as it reaches the border of the document? Please keep in mind that I am using the Harlowe version of Twine.

This is the first time that I've put a question up on this forum so please let me know if you need anymore details.

Cheers,

Alyx