Grid on curves

Good morning,
I am writing these lines because I would like to modify my code to ensure that a grid appears on my curves instead of a horizontal line as in the attached photo. Do you have any idea on which arguments or lines should be changed?

Thank you in advance for your precious help.

Assuming you want to use altair, here is an example.
https://altair-viz.github.io/gallery/simple_line_chart.html

And you can still have the option to move (zoom or translate) with it?

Of course you can.

https://altair-viz.github.io/gallery/scatter_tooltips.html

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