fragment_timer.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:background="@drawable/gradient"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/tv_response"
        style="@style/TextAppearance.MaterialComponents.Headline4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:elevation="2dp"
        android:gravity="center"
        android:textColor="@android:color/white"
        android:textSize="@dimen/response_large"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.4" />

</androidx.constraintlayout.widget.ConstraintLayout>