Problem with Card dark

[senchanew]

hello all!
I'mtrying to use thedarkthemeina panel.
Idid the following:

        var panelHome = new Ext.Panel({
            title: 'Home',
            html:' <p>HELLO</p>'
        });

        var navHome = new Ext.navigation.View({
            title: 'Home',
            items: [
            panelHome
            ],
            iconCls: 'home',
            cls: 'card dark'
        });

  new Ext.TabPanel({
            fullscreen: true,
            tabBarPosition: 'bottom',
            items: [
            navHome
            ]
        });

the home icon, you see, but the issue remains unclear.
how do I use the dark?

[mitchellsimoens]

Do you mean the ui dark using the ui config?

[senchanew]

I do not know exactly.
I have seen a concrete example: 'card dark' and one with ui: 'dark'.
ui is fine with me also.