Css Stying in E4 Compatibility Layer

I can apply Css Styling  in my Eclipse 3.x plugin using following steps:

Step 1. Configuring CSS Stylesheets:


1.1 add a css file

1.2 add a theme using theme extension point

1.3

Step 2. add css id/class to your swt control:

final Composite composite = new Composite(parent, SWT.NONE);
composite.setData("org.eclipse.e4.ui.css.id","MyCSSTagForLabel");

Step 3. add the folowing block to your default.css file:

#MyCSSTagForLabel{

  color: black;

  background: #99b4d1;

  swt-corner-radius: 20;

}

Done!