In themes.xml:

<style name="AppTheme" parent="Theme.AppCompat">
    <!-- Theme attributes here -->
</style>

In AndroidManifest.xml:

<application
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme">
    
    <!-- Activity declarations here -->

</application>