fixed css issues in 2.1 theme

[und3f]

Fixed theme parsing error messages

(gvim:4965): Gtk-WARNING **: 01:32:37.645: Theme parsing error: gtk.css:5601:11:            
 Not using units is deprecated. Assuming 'px'.                                              
                                                                                            
(gvim:4965): Gtk-WARNING **: 01:32:37.645: Theme parsing error: gtk.css:5601:14:            
 '0' is not a valid color name                                                              
                                                                                            
(gvim:4965): Gtk-WARNING **: 01:32:37.645: Theme parsing error: gtk.css:5694:26:            
 'text-shadow' is not a valid color name                                                    
                                                                                            
(gvim:4965): Gtk-WARNING **: 01:32:37.645: Theme parsing error: gtk.css:5702:26:            
 'text-shadow' is not a valid color name                                                    
                                                                                            
(gvim:4965): Gtk-WARNING **: 01:32:37.719: Theme parsing error: gtk.css:5601:11:            
 Not using units is deprecated. Assuming 'px'.                                              
                                                                                            
(gvim:4965): Gtk-WARNING **: 01:32:37.719: Theme parsing error: gtk.css:5601:14:            
 '0' is not a valid color name                                                              
                                                                                            
(gvim:4965): Gtk-WARNING **: 01:32:37.719: Theme parsing error: gtk.css:5694:26:            
 'text-shadow' is not a valid color name                                                    
                                                                                            
(gvim:4965): Gtk-WARNING **: 01:32:37.719: Theme parsing error: gtk.css:5702:26:            
 'text-shadow' is not a valid color name