By default, on BlackBerry 6.0,
        Android,
        and iOS platforms, the jQuery Mobile look and feel is used. On BlackBerry 5.0, a custom look
        and feel is used as the default. 
Note: In Preferences,  Optimize for appearance  is the default look and feel. 
CSS files include:
- jquery.mobile-1.1.0.css
                    – located in Generated
                            Hybrid App\Hybrid
                            App
                        name\html\css\jquery
                    folder and used on BlackBerry 6.0, Android, and iOS platforms. By default, pages
                    are generated using the B data theme. Modify the ui-body-a
                    class selector in this file to modify the look and feel, for example, the
                    background image or color. 
 
- master.css– located in Generated
                            Hybrid App\Hybrid
                            App
                        name\html\css\bb
                    and used on the BlackBerry 5.0 platform. This is used on the BlackBerry 5.0
                    platform when the Optimize for appearance preference is selected. Modify the
                        body selector to change the look and feel, for example, the
                    background color.
 
- stylesheet.css – located in Generated
                            Hybrid App\Hybrid
                            App
                        name\html\css.
                    This look and feel is considerably simpler, using no JavaScript code to
                    manipulate the controls, and only a single CSS file. This style sheet is used on
                    all platforms for the Optimize for performance preference is selected. To modify
                    the background color for this look and feel, modify the body
                    selector.