back ground images animatons

<Content>:
    name: 'content'

    MDBoxLayout:
        orientation:'vertical'
        padding:1
        MDTopAppBar:
            title: 'Oluyimba'
            #type_height:'large'
            left_action_items: [['arrow-left', lambda x: root.callback()],['sda2.png', lambda x: None]]
            right_action_items: [['magnify',lambda x:root.searchrecycle(),'search']]
            elevation: 1
            md_bg_color:app.theme_cls.primary_dark
            specific_text_color:1,1,1,1



        ScrollView:
            size:self.size
            id:scroll
            effect_cls: 'ScrollEffect'
            size_hint: 1,1
            bar_width:4
            bar_color:app.theme_cls.primary_color
            MDBoxLayout:
                adaptive_height:True
                orientation:'vertical'
                size_hint_y:None
                height:self.minimum_height
                width:self.minimum_width
                cols:1
                padding:5
                spacing:20
                MDLabel:
                    text:""
                    id:labelhymn
                    font_size:Factory.Settingsscreen().ids.slid.value
                    #color:app.theme_cls.primary_color
                    adaptive_height:True
                    font_style:'H4'
                    #font_name:'fonts/Roboto-BoldItalic.ttf'
                    bold:True

                MDLabel:
                    text:'                  '
                MDLabel:
                    text:'                  '

                MDLabel:
                    text: "...LUGYA.SAMUEL.JEVIX SOFTWARE ..."
                    color: app.theme_cls.primary_dark
                    font_size: 25
                    #font_name:'fonts/Roboto-BlackItalic.ttf'
                    halign:'center'
                    pos_hint:{'center_x':.5,'center_y':.5}
                    bold:True