VancedManager/app/src/main/res/layout/fragment_vanced_theme_selection.xml

<?xml version="1.0" encoding="utf-8"?>
<com.google.android.material.card.MaterialCardView
    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="wrap_content"
    app:cardCornerRadius="@dimen/eightdp"
    app:cardBackgroundColor="?colorSurfaceVariant"
    android:layout_marginStart="16dp"
    android:layout_marginEnd="16dp"
    android:layout_marginTop="12dp"
    app:cardElevation="0dp"
    app:cardPreventCornerOverlap="true">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/install_theme_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintTop_toTopOf="parent"
            android:textSize="18sp"
            android:textAlignment="center"
            android:textColor="?attr/colorOnSurfaceVariant"
            android:fontFamily="@font/exo_bold"
            android:text="@string/choose_preferred_theme" />

        <RadioGroup
            android:id="@+id/vanced_theme_buttons"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintTop_toBottomOf="@id/install_theme_title"
            app:layout_constraintStart_toStartOf="parent"
            android:checkedButton="@id/button_light_dark">

            <com.google.android.material.radiobutton.MaterialRadioButton
                android:id="@+id/button_light_dark"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textSize="18sp"
                android:text="Light + Dark"
                android:fontFamily="@font/exo_semibold"/>

            <com.google.android.material.radiobutton.MaterialRadioButton
                android:id="@+id/button_light_black"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textSize="18sp"
                android:fontFamily="@font/exo_semibold"
                android:text="Light + Black"/>

        </RadioGroup>

        <com.google.android.material.button.MaterialButton
            android:id="@+id/vanced_next_to_variant"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toBottomOf="@id/vanced_theme_buttons"
            android:layout_marginEnd="6dp"
            android:text="@string/next"
            android:textAllCaps="false"
            app:icon="@drawable/ic_keyboard_next"
            app:iconGravity="end"/>

    </androidx.constraintlayout.widget.ConstraintLayout>

</com.google.android.material.card.MaterialCardView>