Single tab in tab layout is not taking entire screen/full width

[AC Question]

This is the tab layout. I have tried adding tabGravity as 'fill' and tabMaxWidth as '0dp'.

<android.support.design.widget.TabLayout
android:id="@+id/tabanim_tabs"
android:layout_width="match_parent"
android:layout_height="@dimen/browser_tab_bar_height"
android:layout_gravity="bottom"
android:background="@drawable/border_for_tabs"
app:layout_collapseMode="parallax"
app:tabGravity="fill"
app:tabIndicatorColor="@color/colorAffiliateName"
app:tabIndicatorHeight="@dimen/tab_indicator_height"
app:tabMaxWidth="0dp"
app:tabMode="fixed"
app:tabPaddingBottom="0dp"
app:tabPaddingEnd="0dp"
app:tabPaddingStart="0dp"
app:tabPaddingTop="0dp"
app:tabTextColor="@android:color/black" />

Please guide me through this.