[Plugin: Fast Secure Contact Form] CSS to change background color?

The Plugin is working well and looks great. Problem is I can’t change the background color of the form to another. I used the CSS part of the settings but it only changed bits of the form not all of it. There is a div style before it with no class or id that has the bc in. I can’t access it in my css to change it. Do you have a method?

https://www.ads-software.com/extend/plugins/si-contact-form/