cleanMachine_android/app/src/main/res/values/styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@android:color/holo_blue_light</item>
        <item name="colorPrimaryDark">@android:color/holo_blue_light</item>
        <item name="colorAccent">@android:color/holo_blue_light</item>
        <item name="colorControlNormal">@android:color/white</item>
    </style>

</resources>