Altair: How can I style the tooltip when creating a custom theme?

[jan-scorl]

I couldn't find anything in 'Top-Level Chart Configuration' or 'altair.Tooltip'.

[jakevdp]

There are no options within Altair to change tooltip styles. If you want more flexible tooltips, you can use vega-embed directly along with the vega-tooltip plugin. As far as I know, there is not any existing documentation or examples of doing this from Altair.

[jan-scorl]

Thank you Jake. If I manage to figure it out, I will write a tutorial.
I have deprioritized it for now though, so it might not happen soon.