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