<android.support.design.widget.TabLayout
android:id="@+id/tab_layout"
android:layout_width="210dp"
android:layout_height="28dp"
android:layout_centerInParent="true"
android:background="@drawable/bg_forum_tab"
app:tabIndicatorColor="@color/colorBtnBg"
app:tabIndicatorHeight="0dp"
app:tabPaddingBottom="-1dp"
app:tabPaddingEnd="-1dp"
app:tabPaddingStart="-1dp"
app:tabPaddingTop="-1dp"
app:tabSelectedTextColor="@color/colorBtnBg"
app:tabTextColor="@color/colorWhite" />
Set tabPaddingStart/tabPaddingEnd/tabPaddingTop/tabPaddingBottom like this.