title: PagerTabStrip title background color
body: <p>I changed the background color in PagerTabStrip, but the tabs titles have a white background</p>
  
  <pre><code>&lt;android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:id="@+id/pager"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context=".MainActivity" &gt;
  
  &lt;android.support.v4.view.PagerTabStrip
      android:id="@+id/pager_tab_strip"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_gravity="top"
      android:background="#c9c9c9"
      android:padding="4dp"
      android:textColor="#000000"
      /&gt;
  </code></pre>
  
  <p></p>
  
  <p>where do I change it?</p>