Change color of entry form boxes

If I cannot get an answer in reasonable time to what must be a simple question, I will start looking for another plugin that has better support.

Well, I found out myself. There are 2 elements in the form: textarea and input.
So, if you use Weaver II as a theme, it’s easy, just add the following in the Advanced Options:
.wpcf7 textarea {background-color: #BBBBBB;}
.wpcf7 input { background-color: #BBBBBB;}