FormToolkit toolkit = new FormToolkit(parent.getDisplay());

		Section section = toolkit.createSection(parent, Section.TITLE_BAR);
		section.setText("Forms Details CSS"); //$NON-NLS-1$
		final Composite client = toolkit.createComposite(section, SWT.WRAP);

Section{
    background-color: #e3efff #c1d5ef 60%;
}

   <extension
         point="org.eclipse.e4.u.css.core.elementProvider">
      <provider
            class="css.MyCssProvider">
         <widget
               class="org.eclipse.ui.forms.widgets.Section">
         </widget>
      </provider>
   </extension>
   <extension
         point="org.eclipse.e4.ui.css.swt.property.handler">
      <handler
            adapter="css.SectionElement"
            composite="true"
            handler="org.eclipse.e4.ui.css.swt.properties.css2.CSSPropertyBackgroundSWTHandler">
         <property-name
               name="background-color">
         </property-name>
         <property-name
               name="background-image">
         </property-name>
         <property-name
               name="background">
         </property-name>
      </handler>
   </extension>

public class MyCssProvider extends SWTElementProvider{

	@Override
	public Element getElement(Object element, CSSEngine engine) {
		return createElement(element, engine);
	}
	
	public CSSStylableElement createElement(Object element, CSSEngine engine) {
		CSSStylableElement elment = super.createElement(element, engine);
		if (element instanceof Section) {
			return new SectionElement((Section) element, engine);
		}
		return elment;
	}

}

public class SectionElement extends ControlElement {
	
	public SectionElement(Section section, CSSEngine engine) {
		super(section, engine);
	}

	public int getLength() {
		return getSection().getChildren().length;
	}

	public Node item(int index) {
		Widget w = getSection().getChildren()[index];
		return getElement(w);
	}

	protected Section getSection() {
		return (Section) getNativeWidget();
	}

}

@Inject
	public void initUi(Composite parent, PersonService personService ){
		FormToolkit toolkit = new FormToolkit(parent.getDisplay());

		Section section = toolkit.createSection(parent, Section.TITLE_BAR);
		section.setText("Forms Details CSS"); //$NON-NLS-1$
		final Composite client = toolkit.createComposite(section, SWT.WRAP);