🎨 Style scrollbar

[jnywong]

Closes jupyter-book/mystmd#1672.

Here is what the changes look like in both light and dark mode for a Chromium-based browser:

No changes were needed for Firefox, hence the use of -webkit-scrollbar only.

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Latest commit: 3b06af1

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[rowanc1]

🚀

[agoose77]

I think the Chromium styling is perhaps better than the Firefox after this PR w.r.t. the background colour of the scrollbar. Should we follow up and touch that too?

[choldgraf]

Jenny your website looks awesome!

[jnywong]

I think the Chromium styling is perhaps better than the Firefox after this PR w.r.t. the background colour of the scrollbar. Should we follow up and touch that too?

I can easily go back in and take a look at that. I initially decided against it because I wanted to make CSS changes as minimal as possible.