How can I add custom CSS form fields in infinite list widget?

how can i add custom css form fields in infinite list widget?

I understand that you want to apply custom CSS code to the fields in the infinite list widget. Is that correct? If so, you may add the CSS code to the widget in the Custom CSS section in the widget wizard.

You may get the field IDs/Names of the fields in the widget by using Inspect Element feature of the browser. Please check the guide below:

http://kb.oboxthemes.com/articles/how-to-get-css-styles-for-elements/

Hope this information helps!