how can i make my forms transparent to see more of the background image

Are you are referring to this form: https://www.jotform.com/91586387049168? 

If yes, then for card forms, it is possible to make only the Welcome page and the Thank you page as transparent. There is also currently no CSS options to make the rest of the form transparent.

If you want to take advantage of this, then you could consider changing the form layout to Classic - How-to-Change-the-Form-Layout#How-Can-I-Change-the-Layout-from-Cards-to-Classic. In Classic forms, the Form Designer has more features and adding CSS codes is also possible.