How to separate questions with line/border?

I would like to add lines/borders in between questions within my form. Is this possible? Thanks. 

You can use the following CSS code to achieve that effect:

.form-line[data-type="control_rating"]{

border-bottom:1px solid;

}

This is the end result of the custom CSS code I provided.

As you can see, there are thin lines now after every question.

To inject the custom CSS code I have provided, you will have to go to the form Preferences in Form Builder.

In Form Builder, in the Form Styles tab you will need to add the code I have provided in the Inject Custom CSS field.

Please let me know if this achieves what you wanted.