Material TextInputLayout styles are not working.

I followed the documentation on material textinputlayout here:
<https://material.io/develop/android/components/text-input-layout/>

```
<com.google.android.material.textfield.TextInputLayout
    style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:layout_marginEnd="8dp"
    android:hint="@string/app_name"
    app:boxStrokeColor="@android:color/white"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent">

    <com.google.android.material.textfield.TextInputEditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</com.google.android.material.textfield.TextInputLayout>

```

With gradle:

```
implementation 'com.google.android.material:material:1.1.0-alpha02'

```

Using the style OutlinedBox, I expect to have the layout to have an outline but instead it just shows a plain TextInputLayout.

[![enter image description here](https://i.stack.imgur.com/yTZ3A.png)](https://i.stack.imgur.com/yTZ3A.png)