How to style Jotform's new layout with CSS?

I need help formatting certain text within questions. I would use the CSS helper, but the options won't work. i.e. Font Size button in CSS Helper is grey and I cant click on it. 

I need to be able to have the word "Question #." bolded and certain words within the question to be italicized and bold. The previous version of this same form worked, but with the new version (I cloned the form from another version and this one needs edits to update: dates, add a new question, and change the question numbers)

Unfortunately, CSS won't work when using the new layout. You will need to revert to the old style in order to apply CSS styling.

You may change the form layout setting from the form settings to display all the questions in one page. Please see the screenshot below: 

Let me know if you have any questions or if you need further help.