Unnecessary Scrollbar in Left Navigation Bar on Intro Page

[jeremy-feng]

Describe the bug

Context
When I visit the website at https://executablebooks.github.io/cookiecutter-jupyter-book/intro.html.

Expectation
I expected the navigation bar on the left to either utilize the full height of the page or not display a scrollbar if it doesn't need to scroll.

Bug
But instead, the navigation bar shows a scrollbar even though it does not extend to the bottom of the page, and there is no content to scroll through.

Problem
This is a problem for users navigating the site because the unnecessary scrollbar can be visually distracting and may lead to confusion about whether there is more content to view or scroll to. It affects the overall user experience and the aesthetic of the website.

Reproduce the bug

1. Open a web browser.
2. Navigate to https://executablebooks.github.io/cookiecutter-jupyter-book/intro.html.
3. Observe the left-hand navigation bar.
4. Notice that a scrollbar is present despite the navigation bar not needing to scroll.

List your environment

No response