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

<?xml version="1.0" encoding="utf-8"?>
<com.vanced.manager.ui.core.SlidingConstraintLayout
    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="match_parent">

    <com.google.android.material.card.MaterialCardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginStart="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginTop="12dp"
        app:cardElevation="0dp"
        app:cardCornerRadius="@dimen/eightdp"
        app:cardBackgroundColor="?colorSurfaceVariant"
        app:cardPreventCornerOverlap="true"
        app:layout_constraintTop_toTopOf="parent">

        <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">

                <RadioButton
                    android:id="@+id/button_light_dark"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:textSize="18sp"
                    android:text="@string/install_light_dark"
                    android:fontFamily="@font/exo_semibold"/>

                <RadioButton
                    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="@string/install_light_black"/>

            </RadioGroup>

            <Button
                style="@style/Widget.AppCompat.Button.Borderless"
                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>

</com.vanced.manager.ui.core.SlidingConstraintLayout>