Fixed overflow when scrolling up

[ugtthis]

Sidebar showing if scrolled up too much

This shows up for both mobile and desktop.

First one shows the overflow second shows it fixed

https://github.com/commaai/new-connect/assets/142481257/801b3ad6-ea1a-444c-8a8c-52c6bbde3c45

[ugtthis]

Closing an reopening to re-trigger Preview build

[github-actions[bot]]

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deployed preview: https://18.connect-d5y.pages.dev

[incognitojam]

I couldn't reproduce the overscroll on Windows Chrome or Android... I assume it's on macOS and iOS.

[ugtthis]

Oh I see, for this PR I tested with the preview links on my iPad, iPhone, and Macbook