dropdown hotspot font size not changing in different mediums

[Flare00]

Thanks in advance for any help!

I need the dropdown hotspot font size to change in different mediums (default, tablet, mobile).
I set it in the CSS, and see it working in the editor when I select the different mediums, but it will not work when published to HTML5...any browser?

I can set other dropdown hotspot properties like font style or weight and I see it change in mediums when published, just not font size?

[AlexFox]

The MadCap|* style classes are a little odd sometimes. They are converted at buildtime into other classes and you likely need to target those in your CSS instead, this means it will work in the browser, but not in the Flare editor