Why does the toolbar's background change?

Question

XML

Why does the toolbar's background change?
Becomes such as in the screenshot as if transparent.


xml code

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".MainActivity">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorGrayDark"
        android:minHeight="?attr/actionBarSize"
        android:theme="?attr/actionBarTheme"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottomBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorWhite"
        app:menu="@menu/menu"
        app:itemIconTint="@color/colorOrangeDark"
        android:textColor="@color/colorOrangeDark"
        app:itemTextColor="@color/colorOrange"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

java code

public class MainActivity extends AppCompatActivity {

    ActivityMainBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        setSupportActionBar(binding.toolbar);
    }
}

Theme Code

<resources xmlns:tools="http://schemas.android.com/tools">
    <!-- Base application theme. -->
    <style name="Theme.FreeLitecoinFaucet" parent="Theme.AppCompat.DayNight.NoActionBar">
        <!-- Primary brand color. -->
        <item name="colorPrimary">@color/purple_500</item>
        <item name="colorPrimaryVariant">@color/purple_700</item>
        <item name="colorOnPrimary">@color/colorWhite</item>
        <!-- Secondary brand color. -->
        <item name="colorSecondary">@color/teal_200</item>
        <item name="colorSecondaryVariant">@color/teal_700</item>
        <item name="colorOnSecondary">@color/colorBlack</item>
        <!-- Status bar color. -->
        <!-- Customize your theme here. -->

        <item name="android:windowFullscreen">true</item>
        <item name="android:screenOrientation">portrait</item>
        <item name="actionBarStyle">@color/colorGrayDark</item>
        <item name="actionBarTabBarStyle">@color/colorGrayDark</item>
        <item name="actionBarTabStyle">@color/colorGrayDark</item>

    </style>
</resources>

The color that should be

<color name="colorGrayDark">#303030</color>