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You can choose a theme to alter the appearance of your formforms in your flow. provides two global themes : Nouveau or Nouveau Blue. The Nouveau theme gives the forms in your flow a clear (white) background and a submit and cancel button with rounded corners. The Nouveau Blue has the same characteristics of the Nouveau theme and gives your form the forms in the flow a soft blue background.
Of course, you may create a custom theme instead of using the default themes. After you have added the customized them it will appear in the dropdown list along with the pre-defined options.