Hi @dstansby Thank you for this issue, I agree the colors are not very friendly. I had noticed this also in the past, but then forgot to follow up with an issue about it. Would you be interested to submit a PR to improve the color scheme in this example? (Or ideally, any of the first steps examples that need improvement, if you have the interest/bandwidth). The first steps examples are here:

https://github.com/bokeh/bokeh/tree/branch-3.1/docs/bokeh/source/docs/first_steps/examples

A number of new accessible palettes from Paul Tol were added for Bokeh 3.0:

https://docs.bokeh.org/en/latest/docs/reference/palettes.html#accessible-palettes

So colors from those could potentially be used. I have also been preferring background_fill_color="#efefef" lately, but maybe that would confuse/complicate a first steps example. cc @tcmetzger

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