How to remove the grey box background?

This CSS code isn't working for me. I still see the grey box.  Please help.  Thanks

Are you referring to this form (http://www.jotform.us/form/71425197686164)? If yes, to remove the grey box as show in image below please add this custom CSS code to your form:

.supernova .form-all, .form-all {

    box-shadow: none !important;

}

Here's a guide on: How-to-Inject-Custom-CSS-Codes

Result: 

Hope that helps. If you have questions, please contact us again. Thank you.

Thanks! worked perfectly!