peguins-read/app/src/main/res/layout/fragment_about.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/aboutfrag"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".fragments.AboutFragment">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="About Us"
        />

</FrameLayout>