habitica-android/Habitica/res/layout/fragment_gem_purchase.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView android:layout_height="wrap_content"
        android:layout_width="wrap_content"

        android:layout_marginTop="5dp"
        android:text="Help support Habitica"
        android:layout_gravity="center_horizontal">

    </TextView>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="+ 20"
        android:id="@+id/btn.purchase.gems"
        android:layout_gravity="center_horizontal"
        android:drawableRight="@drawable/ic_header_gem"
        android:drawablePadding="5dp"
        android:textColor="@color/white"/>
</LinearLayout>