use button_bg

mobile/src/main/res/layout/activity_webbrowser.xml

@@ -26,7 +26,7 @@
             android:id="@+id/web_btn_download_prerelease"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:background="@drawable/button_n"
+            android:background="@drawable/button_bg"
             android:text="@string/Download"
             android:visibility="gone"/>
 

mobile/src/main/res/layout/dialog_deck_share.xml

@@ -42,7 +42,7 @@
                     android:layout_width="140dp"
                     android:layout_height="50dp"
                     android:layout_marginTop="20dp"
-                    android:background="@drawable/button_n"
+                    android:background="@drawable/button_bg"
                     android:text="@string/ydk_share"
                     android:textSize="15sp" />
             </LinearLayout>
@@ -73,7 +73,7 @@
                     android:layout_height="50dp"
                     android:layout_gravity="center"
                     android:layout_marginTop="20dp"
-                    android:background="@drawable/button_n"
+                    android:background="@drawable/button_bg"
                     android:text="@string/code_share"
                     android:textSize="15sp" />
             </LinearLayout>

mobile/src/main/res/layout/dialog_upgrade.xml

@@ -49,7 +49,7 @@
             android:layout_height="45dp"
             android:layout_below="@id/tv_upgrade_feature"
             android:layout_weight="1"
-            android:background="@drawable/button_n"
+            android:background="@drawable/button_bg"
             android:gravity="center"
             android:tag="beta_confirm_button"
             android:text="@string/Download"

mobile/src/main/res/layout/nav_main_head.xml

@@ -47,7 +47,7 @@
                 android:layout_height="wrap_content"
                 android:layout_gravity="right"
                 android:layout_margin="5dp"
-                android:background="@drawable/button_n"
+                android:background="@drawable/button_bg"
                 android:gravity="center"
                 android:text="@string/donation"
                 android:textAppearance="@style/TextAppearance.AppCompat.Caption"