How can I remove the background of Linear Layout?

I have a button inside my linear layout, and for the linear layout in my activity, even though I am not specifying a background, it appears to be grey in color as shown in the image below. How can I remove that?

Activity Layout file

<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:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">


//This is the linear layout I am talking about where I do not want the grey background
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@android:color/transparent"
    android:id="@+id/LinearLayoutView1"
    >

    <Button
        android:id="@+id/uploadAllReportsNew"
        android:layout_width="match_parent"
        android:layout_height="40dp"

        android:background="@drawable/flightclosurebutton"
        android:paddingLeft="30dp"
        android:paddingRight="30dp"
        android:text="Upload All"
        android:layout_gravity="center"
        android:layout_marginRight="15dp"
        android:layout_marginLeft="15dp"
        android:layout_marginTop="15dp"
        android:layout_marginBottom="15dp"


        android:textAllCaps="false"

        />

</LinearLayout>

<com.google.android.material.bottomnavigation.BottomNavigationView
    android:id="@+id/bottom_navigation"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"

    app:layout_constraintBottom_toBottomOf="@+id/constraint_layout"
    app:menu="@menu/bottom_navigation" />

</LinearLayout>