I cannot find a way to get a FAB with no border. For example when I try:

```
<android.support.design.widget.FloatingActionButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/fab"
    android:background="@android:color/transparent"
    android.support.design:fabSize="normal"
    android:adjustViewBounds="true"
    style="@style/Fab"/>

```

I get:

![Screenshot](https://i.stack.imgur.com/Faa9c.png)

Notice the border still around the FAB. I have tried adjustViewBounds="true" and android:background="@android:color/transparent" both of which are the suggested solutions for getting rid of the border on an ImageView (which FAB extends) but neither work. How can I get rid of this border?

Note: all @style/Fab does is position the button, nothing to do with border.