increase spacing above and below the top header

src/main/res/layout/whats_new_activity.xml

@@ -29,11 +29,11 @@
         android:id="@+id/welcomeText"
         android:layout_width="match_parent"
         android:layout_height="0dp"
-        android:layout_marginBottom="@dimen/alternate_half_margin"
+        android:layout_marginBottom="@dimen/standard_double_margin"
         android:layout_marginLeft="@dimen/alternate_margin"
         android:layout_marginStart="@dimen/alternate_margin"
-        android:layout_marginTop="@dimen/alternate_half_margin"
-        android:layout_weight="6"
+        android:layout_marginTop="@dimen/standard_double_margin"
+        android:layout_weight="10"
         android:gravity="center"
         android:text="@string/placeholder_sentence"
         android:textAppearance="?android:attr/textAppearanceLarge"
@@ -43,7 +43,7 @@
         android:id="@+id/contentPanel"
         android:layout_width="match_parent"
         android:layout_height="0dp"
-        android:layout_weight="86">
+        android:layout_weight="82">
     </android.support.v4.view.ViewPager>
 
     <LinearLayout