Can't see the bottom of very long table of contents floaty when needing to scroll

[mithro]

Conditions;

• Create a page which has enough headings that the table of contents floaty thing in the top right doesn't all fit on the screen
• The table of contents floaty should end up with a scrollbar.
• Try to scroll to the bottom of the contents floaty. Notice that you can't see the bottom items.

Example can be found at https://skywater-pdk--136.org.readthedocs.build/en/136/rules/device-details.html

Screenshot below;

It does let you see the bottom of the contents floaty if you scroll the page all the way down to the bottom, see below;