BayernMessenger/vector/src/main/res/drawable/vector_tabbar_selected_background_light.xml

<?xml version="1.0" encoding="utf-8"?>

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle">
            <solid android:color="@color/list_divider_color_light" />
            <padding android:bottom="1dp" />
        </shape>
    </item>

    <item>
        <shape android:shape="rectangle">
            <solid android:color="@android:color/white" />
            <padding android:bottom="2dp" />
        </shape>
    </item>
    <item>
        <shape android:shape="rectangle">
            <solid android:color="@color/tab_bar_selected_background_color_light" />
        </shape>
    </item>
</layer-list>