'ROR - scatter graph - how to add background image?

Not sure this question is allowed here. I am not looking for an opinion but an answer on how to approach this. I am scratching my head where to find help on technically how to approach this.- not sure where else to look for it.

Rails 6.0 tailwindcss stimulusjs

Here is my question:

I am plotting 2 axis of data (plan to use Chartkick & scattergraph). Once I plot them, I want to show them against a background image. I want to do it on a background like this?

[https://monosnap.com/file/4NNH3y9nOPxXFaClg661DQBw6ujyBe]

I am a novice on CSS. Is it just straight CSS? What is best approach to this? Raw CSS? Plugin? other?



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