There are two transparent vertical strips on both sides of my TabLayout. It looks like this:

[![app screenshot](https://i.stack.imgur.com/Yqvkw.jpg)](https://i.stack.imgur.com/Yqvkw.jpg)

It appeared after I removed `android:theme="@style/AppTheme.ActionBar"` from TabLayout, because it didn't show TabLayout indicator:

[![app screenshot](https://i.stack.imgur.com/Njlbo.jpg)](https://i.stack.imgur.com/Njlbo.jpg)

What might be the issue?

My layout:

```
 <android.support.design.widget.CoordinatorLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="my.beeline.kz.ui.ScrollableController">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@null"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:theme="@style/AppTheme.ActionBar"
            app:layout_collapseMode="none"
            app:layout_scrollFlags="scroll|enterAlways|snap"
            app:titleMarginStart="@dimen/toolbar_title_margin"/>

        <android.support.design.widget.TabLayout
            android:id="@+id/tab_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@null"
            app:tabMinWidth="120dp"
            app:tabSelectedTextColor="@color/black"
            app:tabTextAppearance="@android:style/TextAppearance.Widget.TabWidget"
            app:tabTextColor="@color/gray_solid"/>

    </android.support.design.widget.AppBarLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/gray_very_light"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

</android.support.design.widget.CoordinatorLayout>

```

Update:
-------

Solution was to remove `android:background="@null"` from AppBarLayout