Output box not sized properly for traversal of AVLTree in Trinket

[JMCanning78]

Steps to reproduce.

1. Browse https://datastructures.live/view/
2. Select the Run button to launch Trinket
3. Select the Select Visualization > Chapter 10: AVL Tree button
4. Enter 5 in the text entry box
5. Select Random Fill, this should produce a tree with keys 12, 17, 28, 38, and 64.
6. Select In-order Traverse. Wait until all the keys are copied to the output box.

The last key, 64, ends up on the second line of the output box.

This does not occur running the visualization locally on my mac.