How do I style Section and ScrolledForm headers in Eclipse RAP?

Question

In Eclipse RAP most components can be styled through CSS e.g.:

Combo:hover {
  background-color: #DDDDDD;
}
Combo-Button:hover {
  background-color: #DDDDDD;
}

How can I style Section and ScrolledForm components? They seem to be linked to the Shell-Titlebar but what if I want to have a different Shell titlebar and Section header?

This CSS creates the following output:

Shell-Titlebar {
  background-color: #ff0000;
}

The style which manipulates the font color is the following (yes the background-color):

List-Item {
  /** this is for Section and Form heading font color */
  background-color: #4A4A4A;    
}