On the SETTINGS tab of the Form Designer, you can change the appearance of your Form. This is also where you can change the Name of the Form:
Below the Form Name is where you can select a theme to change the default colors and fonts on the Form, so you're consistent with your website and brand:
Use the CSS CLASS box to further customize your Form:
Note: The custom CSS is for advanced users only, such as a webmaster or web designer. Member Support does not assist with Custom CSS.