How to display in superscript in single choice entry?

Greetings and thank you for your message.

I have created a form with the Single choice style you need. You can view it here:
https://form.jotform.com/200884775649067

You don't need to use custom CSS to add superscript. Simply open the Single choice Properties and add the <sup> tags around the words you wish to be superscripted from the Options tab:

The code above will result in the following:

Please feel free to clone my form for more details. To see how to clone a form, you can use the following link:
https://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL

If you wish to further customize the superscripted text, you can use span instead of the sup, add a class to it, and modify the text in the CSS editor. To create a superscripted from a span, you can use the following CSS: vertical-align: super

Please let us know if you have any further questions.