Signal-Android/app/src/main/res/layout/stories_viewer_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/story_item_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" />

    <org.thoughtcrime.securesms.stories.viewer.reply.StoriesSharedElementCrossFaderView
        android:id="@+id/story_content_crossfader"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:alpha="0"
        android:clipChildren="false"
        android:clipToPadding="false"
        android:transitionName="story"
        app:cardCornerRadius="12dp"
        app:cardElevation="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintDimensionRatio="9:16"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0" />
</androidx.constraintlayout.widget.ConstraintLayout>