Footnotes and Themes

Are there any themes that allow for footnotes to show automatically when the cursor is hovering over the footnote marker?

Or is there a way to make this happen without having to purchase/download a new theme?

You can follow that,
Just add a HTML block for the footnote code and and use the CSS in code injection area… You can get that in any theme you are using. If you are interested then check out our themes,

You could use