adjust tabs in nav screen

Change-Id: Iaf34ae0d1e143508cb109c96612ba539ad7dd31b
diff --git a/res/layout/nav_screen.xml b/res/layout/nav_screen.xml
index fee45b1..b4e1f15 100644
--- a/res/layout/nav_screen.xml
+++ b/res/layout/nav_screen.xml
@@ -31,35 +31,40 @@
         android:orientation="horizontal"
         android:layout_width="match_parent"
         android:layout_height="44dip"
+        android:gravity="right"
         android:background="#C0404040">
         <ImageButton
             android:id="@+id/newtab"
-            android:layout_width="0dip"
-            android:layout_weight="0.25"
+            android:layout_width="wrap_content"
             android:layout_height="match_parent"
+            android:paddingLeft="16dip"
+            android:paddingRight="16dip"
             style="@style/HoloButton"
             android:gravity="center_vertical"
             android:src="@drawable/ic_new_window_holo_dark" />
         <ImageButton
             android:id="@+id/newincognito"
-            android:layout_width="0dip"
-            android:layout_weight="0.25"
+            android:layout_width="wrap_content"
             android:layout_height="match_parent"
+            android:paddingLeft="16dip"
+            android:paddingRight="16dip"
             style="@style/HoloButton"
             android:gravity="center_vertical"
             android:src="@drawable/ic_new_incognito_holo_dark" />
         <ImageButton
             android:id="@+id/bookmarks"
-            android:layout_width="0dip"
-            android:layout_weight="0.25"
+            android:layout_width="wrap_content"
             android:layout_height="match_parent"
+            android:paddingLeft="16dip"
+            android:paddingRight="16dip"
             android:src="@drawable/ic_bookmarks_history_holo_dark"
             style="@style/HoloButton" />
         <ImageButton
             android:id="@+id/more"
-            android:layout_width="0dip"
-            android:layout_weight="0.25"
+            android:layout_width="wrap_content"
             android:layout_height="match_parent"
+            android:paddingLeft="16dip"
+            android:paddingRight="16dip"
             style="@style/HoloButton"
             android:gravity="center_vertical"
             android:src="@*android:drawable/ic_menu_moreoverflow_normal_holo_dark" />