How can I adjust font-size settings without changing banner size?

[liliOD]

Hey there, 

I want to add a new setting font-size range to my theme, but it doesn't change the font size, in fact it just change the banner size.

the json looks like this:

I don't know if I must edit the css

[Ufrancis84]

I would recommend you contact the customer service and they will be willing to help you with that.