Bibliography: Scroll Bars missing in Chrome

[stumbo]

Describe the bug
When viewing the Bibliography in Chrome the scroll bars are missing. There is no scroll bar for the bibliography entries or the author tags.

To Reproduce
Steps to reproduce the behavior:

1. Open Interlisp.org and navigate to the bibliography
2. Notice lack of scroll bars. Scroll wheel on a mouse will scroll the material

Expected behavior
Scroll bars for both the bibliography entries and the taxonomy window that allow navigation without relying on a scroll wheel.

Screenshots

[MattHeffron]

This seems to be not just in "Chrome" but in any browser that uses the "Chromium" core, as it is in Microsoft Edge as well.