launcher/app/src/main/res/layout/fragment_settings_theme.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="?attr/colorPrimary"
    android:gravity="center|top"
    android:orientation="vertical"
    android:padding="32sp"
    tools:context=".SettingsActivity">

    <!--Button
        style="@style/Widget.AppCompat.Button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="setLauncher"
        android:text="@string/settings_select_launcher"
        android:textAllCaps="false" /-->


    <androidx.cardview.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10sp"
        android:theme="@style/finnmglasTheme">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="?attr/colorAccent">

            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Activate"
                app:layout_constraintEnd_toEndOf="parent" />
        </androidx.constraintlayout.widget.ConstraintLayout>

    </androidx.cardview.widget.CardView>

    <androidx.cardview.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="10sp"
        android:theme="@style/darkTheme">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="?attr/colorAccent">

            <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Activate"
                app:layout_constraintEnd_toEndOf="parent" />
        </androidx.constraintlayout.widget.ConstraintLayout>

    </androidx.cardview.widget.CardView>
</LinearLayout>