ZK supports four different style classes for window: embedded, overlapped, popup and wndcyan. Of course, you can add more if you want.

By default, the sclass property is the same as the window mode, so windows in different modes appear differently. To change the appearance, simply assign a value to the sclass property as illustrated in the following example.

<hbox>
    <window title="Embedded Style" border="normal" width="200px">    
        Hello, Embedded!        
    </window>    
    <window title="Cyan Style" sclass="wndcyan" border="normal" width="200px">    
        Hello, Cyan!        
    </window>    
    <window title="Popup Style" sclass="popup" border="normal" width="200px">    
        Hello, Popup!        
    </window>    
    <window title="Modal Style" sclass="modal" border="normal" width="200px">    
        Hello, Modal!        
    </window>    
</hbox>