Background color for blank entry fields.

No trouble so far adding fields to the form, making other adjustments, and adding the form to a webpage by placing the text [si-contact-form form=’1′] in a Text Block using Visual Composer.

But I would like the background color of the input text entry fields and input textarea fields to be white. I don’t see anything on the Styles tab to change that. I read something somewhere about adding some code to accomplish that. Being a newbie to code, I just don’t know what code to add and where to put it or how to put it where it needs to go. I think I’m supposed to open the Text Block, click on the Text tab and add some code on the next line following first line [si-contact-form form=’1′]. But still, I don’t really know what to add and where exactly to add it.

Would appreciate any help with exact instructions to accomplish.

Thanks.