In the Edit → Themes section you can manage your form themes, choose a predefined theme for your form, customize one or start building a form theme from scratch. Keep in mind that our default themes can’t be removed. After you’ve edited or created a theme click the Save current theme button. Your theme list can be accessed in the Change theme area on all your forms.
The Add Custom CSS Editor allows you to customize the appearance of your theme. Add as many CSS attributes as you need to our form IDs and classes.
Explore all the options available in the customization panel. Customization options are listed under each subsection ( Form, Page, Label, Instructions, Input, Field, Field Hover, Field Focus, Error, Buttons and Choices).